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Grey's Anatomy (season 9)
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Grey's Anatomy (season 9)
DVD cover art for the ninth season of
Grey's Anatomy
Starring
Ellen Pompeo
Sandra Oh
Justin Chambers
Chandra Wilson
James Pickens, Jr.
Sara Ramirez
Eric Dane
Kevin McKidd
Jessica Capshaw
Sarah Drew
Jesse Williams
Patrick Dempsey
Country of origin
United States
No. of episodes
24
Release
Original network
ABC
Original release
September 27, 2012 (2012-09-27) – May 16, 2013 (2013-05-16)
Season chronology
← Previous
Season 8
Next →
Season 10
List of Grey's Anatomy episodes
The ninth season of the American television medical drama Grey's Anatomy began airing in the United States on the American Broadcasting Company (ABC) on September 27, 2012,[1] with the season premiere Going, Going, Gone and consists of 24 episodes with the finale Perfect Storm airing on May 16, 2013.[2] The season was produced by ABC Studios, in association with Shondaland Production Company and The Mark Gordon Company; the showrunner being Shonda Rhimes. The season was officially released on DVD as a six-disc boxset under the title of Grey's Anatomy: The Complete Ninth Season - Everything Changes on August 27, 2013 by Buena Vista Home Entertainment.
The season follows the characters dealing with the aftermath of the season eight plane crash that claimed the life of Lexie Grey (Chyler Leigh) and upon rescue Mark Sloan (Eric Dane), who dies after sustaining injuries from the crash. Derek Shepherd (Patrick Dempsey) finds his surgical career in doubt after badly damaging his hand but Callie Torres (Sara Ramirez) ultimately manages to save his hand. The show's protagonist Meredith Grey (Ellen Pompeo) deals with the loss of her half-sister Lexie and later discovers that she is pregnant. Cristina Yang (Sandra Oh) who is severely traumatized upon rescue and later decides to take up her fellowship in Minnesota. Arizona Robbins (Jessica Capshaw) another survivor of the plane crash upon return realizes that her leg has to be amputated to save her life, reacts badly to this, becoming bitter and blaming her wife Callie and her former friend Alex Karev (Justin Chambers). To prevent the doctors' court case from being thrown out, Owen Hunt (Kevin McKidd) decides to divorce Yang, but the two agree to start again. The hospital itself becomes liable for the crash, putting its future in extreme doubt prompting the four crash survivors and Torres to purchase the hospital. Miranda Bailey (Chandra Wilson) marries her partner Ben Warren (Jason George), April Kepner (Sarah Drew) returns home to Ohio, but is brought back by Hunt to rejoin the hospital and she restarts her relationship with Jackson Avery (Jesse Williams).
The season ended with an average of 12.51 million[3] viewers and ranked no. 26 which was higher than the previous two seasons and in the 18-49 key demographic ranked at no. 10. Ellen Pompeo won the Favorite TV Drama Actress at the 39th People's Choice Awards and the show itself won the Favorite Network TV Drama. It was announced by ABC on May 10, 2013 that the tenth season of Grey's Anatomy would begin in the fall of 2013.[4]
Contents
[hide]
1 Plots
2 Cast
2.1 Main cast
2.2 Recurring cast
2.3 Casting
2.4 Development
3 Reception
3.1 Ratings
3.2 Critical reception
4 Episodes
5 Ratings
5.1 Live + SD ratings
5.2 Live + 7 Day (DVR) ratings
6 DVD release
7 References
Plots[edit]
The season follows the story of surgical interns, residents and their competent mentors, as they experience the difficulties of the competitive careers they have chosen. It is set in the surgical wing of the fictional Seattle Grace-Mercy West Hospital, located in Seattle, Washington. A major theme of the season is the characters adapting to change, as all of the fifth-year surgical residents have turned into surgical attendings, and are now teaching interns, and operating on their own surgeries. The early episodes of the season depict the characters dealing with the aftermath of the season eight plane crash that claimed the life of Lexie Grey (Chyler Leigh) and upon rescue Mark Sloan (Eric Dane), who dies in the first episode.
Derek Shepherd (Patrick Dempsey) finds his surgical career in doubt after badly damaging his hand but ultimately his sister Liz (Neve Campbell) donates a nerve from her leg and Callie Torres (Sara Ramirez) is able to save his hand. Later, Shepherd receives more good news when his wife Meredith Grey (Ellen Pompeo) discovers that she is pregnant, despite her previously being told that it was unlikely that she could conceive. Cristina Yang (Sandra Oh) is severely traumatized upon rescue and suffers from brief reactive psychosis and eventually decides to take up her fellowship in Minnesota, though soon grows unhappy in her new surroundings and returns to Seattle after the death of her friend and mentor, Doctor Thomas. Arizona Robbins (Jessica Capshaw) survives the plane crash in spite of her leg injury, but upon return her wound becomes infected and her leg has to be amputated to save her life. Robbins reacts badly to this, becoming bitter and blaming her wife Callie and her former friend Alex Karev (Justin Chambers) and refuses to leave her bed or return to work.
Derek discovers that prior to the plane crash, the hospital had recently changed airlines to one with a poorer safety record for budgetary reasons, resulting in the four crash survivors (Grey, Shepherd, Robbins and Yang) deciding to pursue a lawsuit, and it soon becomes apparent that chief of surgery Owen Hunt (Kevin McKidd) had given the go-ahead to the change. To prevent the doctors' court case from being thrown out, Hunt decides to divorce Yang, but the two secretly resume their relationship and agree to start again. Despite contemplating a settlement, the doctors decide to continue with the lawsuit and eventually are awarded fifteen million dollars each, but the insurance company discovers an unexpected loophole and refuse to pay, resulting in the hospital itself becoming liable, putting its future in extreme doubt. Dr. Alana Cahill (Constance Zimmer) is appointed to cut costs at the hospital and she eventually decides the best course of action would be to seek out a new buyer and attracts the interest of a company named Pegasus. Later however, Torres and Richard Webber (James Pickens Jr.) discover the unpleasant consequences that would fall upon the hospital should they be taken over by Pegasus prompting the four crash survivors (and Torres on the behalf of Sloan) to pool their money together in a bid to purchase the hospital themselves and quit their jobs, resulting in Pegasus pulling out. The doctors run into trouble when they fail to secure an extra benefactor, but at the last minute Catherine Avery (Debbie Allen) reveals that the Harper Avery Foundation is willing to provide a majority share in the company, on the condition that they have at least one member on the board of directors. The doctors agree and their purchase is complete, only for Catherine to appoint her son Jackson Avery (Jesse Williams) to part of the board, effectively putting him in charge of the entire hospital.
In other storylines, Miranda Bailey (Chandra Wilson) marries her partner Ben Warren (Jason George), despite suffering from last-minute nerves and missing the original wedding ceremony due to Adele Webber (Loretta Devine) being admitted to the hospital. Adele later dies after her surgery, leaving her husband Richard wracked with guilt due to his relationship with Catherine Avery. A new group of interns arrives at Seattle Grace and soon Karev strikes up a close friendship with Jo Wilson (Camilla Luddington) but the pair fall short of developing a romance, despite other characters commenting on their chemistry. After failing her board exams in season eight, April Kepner (Sarah Drew) returns home to Ohio, but is later brought back by Hunt and resumes her job at the hospital. Upon her return, Kepner restarts her sexual relationship with Jackson, despite being filled with conflict due to her religious beliefs. The pair eventually split up when Kepner refuses to make a commitment, and Avery starts dating intern Stephanie Edwards (Jerrika Hinton), while Kepner starts dating a paramedic named Matthew (Justin Bruening).
Cast[edit]
Main articles: List of Grey's Anatomy cast members and List of Grey's Anatomy characters
Main cast[edit]
Ellen Pompeo as Dr. Meredith Grey
Sandra Oh as Dr. Cristina Yang
Justin Chambers as Dr. Alex Karev
Chandra Wilson as Dr. Miranda Bailey
James Pickens Jr. as Dr. Richard Webber
Sara Ramirez as Dr. Callie Torres
Eric Dane as Dr. Mark Sloan (Until Episode 2)
Kevin McKidd as Dr. Owen Hunt
Jessica Capshaw as Dr. Arizona Robbins
Sarah Drew as Dr. April Kepner
Jesse Williams as Dr. Jackson Avery
Patrick Dempsey as Dr. Derek Shepherd
Recurring cast[edit]
Loretta Devine as Adele Webber
Constance Zimmer as Dr. Alana Cahill
William Daniels as Dr. Craig Thomas
Debbie Allen as Dr. Catherine Avery
Justin Bruening as Paramedic Matthew
Neve Campbell as Lizzie Shepherd
Camilla Luddington as Dr. Jo Wilson
Gaius Charles as Dr. Shane Ross
Jerrika Hinton as Dr. Stephanie Edwards
Tina Majorino as Dr. Heather Brooks
Tessa Ferrer as Dr. Leah Murphy
Hilarie Burton as Dr. Lauren Boswell
Charles Michael Davis as Dr. Jason Myers
Steven Culp as Dr. Darren Parker
Eddie Jemison as Stan Grossberg
Nicole Cummins as Paramedic Nicole
Casting[edit]
In May 2012, it was announced that six original cast mates, Ellen Pompeo, Patrick Dempsey, Sandra Oh, Chandra Wilson, Justin Chambers, and James Pickens, Jr. had renewed their contracts for another two seasons, as Meredith Grey, Derek Shepherd, Cristina Yang, Miranda Bailey, Alex Karev, and Richard Webber respectively.[5] In July 2012, it was announced that cast member Eric Dane would not be returning to Grey's Anatomy as a series regular, and would leave after two episodes to give his character a proper ending.[6] In addition, Chyler Leigh requested to be released from her contract to spend more time with her family and her character was killed off in the season eight finale,[7] while Kim Raver also departed from the show following the events of the season eight finale, having declined the offer of a contract extension.[8][9] Other series regulars, Sara Ramirez, Kevin McKidd, Jessica Capshaw, Sarah Drew, and Jesse Williams all returned to the series as regulars, though Capshaw would not have a major role in the first few episodes because of her maternity leave.
Eric Dane made his final appearance as Mark Sloan in the second episode as he succumbed to his injuries from the crash.
In August 2012, it was announced that Camilla Luddington, Gaius Charles, and Tina Majorino had been cast as Jo Wilson, Shane Ross, and Heather Brooks, respectively; these characters would be the new interns of Seattle Grace-Mercy West.[10] TVGuide later reported that even with all of the recurring cast being added to Grey's Anatomy for the new season that True Blood star Camilla Luddington is the only actress with an option to become a series regular.[11] In September 2012, it was announced that Jerrika Hinton and Tessa Ferrer had been cast as new interns Stephanie Edwards[12] and Leah Murphy,[13] respectively. In August 2012, it was announced that Debbie Allen would reprise her role as Catherine Avery at sometime in series,[14] and she is set to direct the third episode. In September 2012, it was announced that Steven Culp would be cast as a new doctor at a new hospital, and would be known as Dr. Parker.[15]
In September 2012, it was announced that William Daniels, former Boy Meets World star, and Jason George would reprise their roles as Dr. Craig Thomas, and Ben Warren respectively.[16] In September 2012, TVLine reported that Bones's Andrew Leeds had been cast in a potentially recurring role for the ninth season.[17] In December 2012, Wetpaint reported that Constance Zimmer had been cast in a recurring role as Dr. Cahill and would appear in at least four episodes.[18] In November 2012 it was announced that Neve Campbell, known for her role in Scream, would be cast as one of Derek's sisters. It was not until late November that her role was revealed as Liz Shepherd, a therapist.[19] In November 2012, it was announced that in 2013, someone would die on Grey's Anatomy.[20] TVGuide then reported that Loretta Devine, who is known as Adele Webber, would be reprising her role for two episodes, and that she would be the one to die.[21] In November 2012, TVLine reported that Nip/Tuck alum Roma Maffia was cast in a recurring role as a member of the hospital board.[22] In December 2012, TVLine and Wetpaint reported that Ringer and Switched at Birth star, Justin Bruening,was cast as a paramedic known as Matt.[23][24]
In January 2013, it was announced that Gaius Charles, Tina Majorino, Jerrika Hinton and Tessa Ferrer were all given the option to become series regulars if Grey's Anatomy were to be renewed.[25] Sarah Chalke is set to guest star in an episode in the spring, as TVLine reported in January 2013.[26] It was announced by E! Online on March 29, One Tree Hill alumni Hilarie Burton will be cast in a recurring role as a specialist in an investigation going on in the hospital. Her character is to arrive on the 22nd episode of the season.[27] However, this later turned out to be untrue as Hilarie Burton ended up portraying a specialist doctor named Lauren Boswell.
Development[edit]
Grey's Anatomy was renewed by ABC on May 10, 2012.[28] In June 2012, ABC set the premiere date of Grey's Anatomy to September 27, 2012, and it would remain in the Thursday at 9:00pm timeslot that it has had since the third season.[1] In October 2012 it was reported that this season would have the same episode count as season eight, meaning it would have a total of 24 episodes.[2] Shonda Rhimes revealed that the season nine finale would not revolve around a 'disaster' episode.[29]
Reception[edit]
Ratings[edit]
Grey's Anatomy's ninth season opened up to 11.73 million viewers with a 4.4/12 Nielsen rating/share in the 18–49 demographic.[30] The viewership for the episode was an 11 percent increase from the previous season premiere, which was viewed by a total of 10.38 million people.[31] The rating was a 7 percent increase from the previous season premiere, which received a 4.1/10 Nielsen rating/share in the 18–49 demographic. The Nielsen score additionally registered the show as the week's highest-rated drama in the 18–49 demographic.[32] As of December 2012 "Going, Going, Gone" has served as the season's most viewed episode.[30] "Run, Baby, Run" is the season's least viewed episode, with 8.17 million viewers and a 2.9/8 Neilsen rating/share in the 18-49 demographic.[33] At the time, the season finale was the series lowest watched season finale with 8.99 million viewers and 3.1 in the 18-49 rating demo.
Loretta Devine made her final appearance as Adele in the first episode of 2013 and garnered positive reviews.
Critical reception[edit]
The season received mostly positive reviews with critics praising numerous aspects of the long running medical drama including the bonds of the characters with each other and its connection with the audience. Robert Bianco of USA Today noted that after 9 seasons, "There's still life left in Grey's."[34] What Culture gave a positive review for the season, "Grey's Anatomy has developed into a fine example of how a TV show can mature beyond its initial purpose."[35] Toronto Star called it "a solid return to form".[36] TV Fanatic gave a largely positive review to the season, "Grey's Anatomy always knows how to bring the drama and they did not fail in the Season 9."[37]
Melissa Maerz of Entertainment Weekly also gave a generally positive response stating, "There's still one good reason to keep watching: Where else can you find such deep friendships between female co-workers?[38] Margaret Lyons of New York Magazine wrote that the first part of the season "has been mostly a downer, thanks in part to a whole bunch of people dying at the beginning of the season and also the shocking lack of interesting romances."[39]
Examiner.com reviewing the season finale wrote, "[Greys] delivered yet another epic and emotional season finale that pushes our characters in challenging new directions". The site added, "Perfect Storm gets 5 out of 5 stars. This storm brought on all kinds of emotional strife and death that truly tests the seasoned doctors and pushes them to their element. They bond together, guiding each other through the dark and as the dust settles from this mayhem, there are casualties of all kinds. The tragedy that leaves us hanging until next fall is one hell of a thrill ride full to the brim with shocks."
Episodes[edit]
Main article: List of Grey's Anatomy episodes
The number in the "No. in series" column refers to the episode's number within the overall series, whereas the number in the "No. in season" column refers to the episode's number within this particular season. "U.S. viewers in millions" refers to the number of Americans in millions who watched the episodes live.
No.
overall
No. in
season
Title
Directed by
Written by
Original air date
U.S. viewers
(millions)
173
1 "Going, Going, Gone" Rob Corn Stacy McKee September 27, 2012 (2012-09-27) 11.73[30]
Several months after the plane crash, Callie and Derek are heartbroken when they realize that they have to take Mark off of life support. Cristina has moved to Rochester, Minnesota and Meredith encourages her to get on a plane to Seattle. Alex worries that the new pediatric surgeon will destroy Arizona's program. Frustrated with his past decisions, Owen visits April and offers her her job back. Meanwhile, Meredith's ruthlessness towards her interns earns her the nickname "Medusa". At the end of the episode, it is revealed that Arizona did survive, but had to have her leg amputated by Callie, whom she resents because of it.
174
2 "Remember the Time" Tony Phelan William Harper October 4, 2012 (2012-10-04) 10.84[40]
A flashback to the aftermath of the plane crash recounts how the doctors dealt with the disaster. Meredith accepts what has happened, and wants to move on with her life, while Derek, afraid he won't regain full use of his hand, turns to teaching. Cristina is catatonic, but slowly recovers under Owen's care. Arizona is afraid of losing her leg, but after the infection takes a turn for the worse, Callie is forced to make the decision to amputate. Mark is in critical condition, but takes a turn for the better before falling into a coma.
175
3 "Love the One You're With" Debbie Allen Zoanne Clack October 18, 2012 (2012-10-18) 9.69[41]
Meredith, Derek, Cristina, Callie and Arizona are offered a large amount of money as a settlement deal from the plane's manufacturer, but the decision has to be unanimous. Jackson and April are put in a stressful situation when they're obligated to work together on a case. Cristina warms up to Dr. Thomas. Callie has to convince a young girl (Skyler Day) with a nearly severed foot to postpone her solo sailing trip in order to save her foot. After visiting the hangar where the crashed plane now sits, Derek decides not to accept the settlement and convinces the others as well. Arizona is bitter towards Callie for making the call to cut off her leg.
176
4 "I Saw Her Standing There" Kevin McKidd Austin Guzman October 25, 2012 (2012-10-25) 8.76[42]
Realizing Derek might never perform surgery again, Meredith stops discussing her cases with him in hopes of keeping his spirits up. While Arizona is in the hospital getting a prosthetic leg, Alex and Callie face the consequences of deciding to amputate. Jackson and April continue to have sex together, while Richard asks Catherine Avery to assist him with the surgery of a man whose testicles have grown to great proportions. Cristina starts sleeping with Dr. Parker but stops when she finds out that he has been using her to force Dr. Thomas to retire.
177
5 "Beautiful Doom" Stephen Cragg Jeannine Renshaw November 8, 2012 (2012-11-08) 9.26[43]
Meredith is forced to juggle parenting with work when Derek has a lecture in Boston. On her way to work, she comes across a car accident and rushes to help a woman whose injuries remind her of Lexie. Meredith and Cristina lean on each other and maintain their long-distance friendship. Meredith is adamant about saving her patient's life, despite complications in surgery. Cristina assists Dr. Thomas with a cardiac case, when he suddenly suffers a heart attack during the operation. Following Dr. Thomas' death, Cristina returns to Seattle.
178
6 "Second Opinion" Chandra Wilson William Harper November 15, 2012 (2012-11-15) 8.84[44]
Cristina returns to Seattle Grace. The crash victims meet with the legal team to decide their actions with moving forward with the lawsuit. Alex asks Meredith to sell him her mother's house. Jo works with a patient dubbed "Santa Claus" who constantly vomits over her and realizes he's been misdiagnosed. Callie feels guilty about Derek's botched hand surgery, while Bailey asks Arizona for help on a case. Jackson admits to April that he has feelings for her. The victims of the plane crash find out that the legal team is actually going after the hospital and Owen for their settlement deal.
179
7 "I Was Made for Lovin' You" Laura Innes Peter Nowalk November 29, 2012 (2012-11-29) 8.95[45]
Arizona returns to the hospital and works on a case with Alex and April. Owen feels responsible for the crash after finding out he switched the hospital's airline prior to the crash due to budget cuts. Bailey begins resenting having a Christmas wedding, while she and Cristina work on a patient who needs a liver transplant. April and Jackson have a pregnancy scare but break up when the test is negative. Callie and Jackson research options to fix Derek's hand. Cristina realizes she wants Owen back, but just before telling him, he asks for a divorce. Meredith tells Derek that she is three weeks pregnant, but doesn't want anyone else to know.
180
8 "Love Turns You Upside Down" Mark Jackson Stacy McKee December 6, 2012 (2012-12-06) 9.10[46]
The first-year interns go on their first 24-hour shift; Meredith tasks her intern, Heather, with calling Derek's family to ask if they would donate a nerve for his hand surgery. Alex and Jo work together on a premature baby whose teen mother abandons her, leading Jo to admit to Alex that she was also abandoned as an infant. Cristina's interns take their rivalry too far and are reprimanded when their negligence almost leads to the death of a patient. Heather finds out that Meredith is pregnant. Derek's sister, Liz (Neve Campbell) comes to Seattle to donate her nerve to Derek.
181
9 "Run, Baby, Run" Rob Corn Debora Cahn December 13, 2012 (2012-12-13) 8.17[33]
With her wedding fast approaching, Bailey enlists April to take care of her patients and asks Meredith, Callie, and Arizona to be her bridesmaids. Meredith and Derek have their first ultrasound. Cristina finds out Owen wants the divorce to avoid being caught in a conflict of interest during the investigation into the crash; after confronting him, they decide to save their relationship. April and Jackson decide to go the wedding with a date, deciding on Shane and Stephanie, respectively. Callie and Jackson operate on Liz and Derek, and Meredith tells Liz about the pregnancy. When Jo cuts too deep during a surgery with Alex, she feels she was set up and complains to Arizona. On their way to the wedding, Richard comforts Bailey when she starts having cold feet, but when Richard gets a call that Adele is in the ER, they are forced to return to the hospital.
182
10 "Things We Said Today" Ron Underwood Austin Guzman January 10, 2013 (2013-01-10) 9.34[47]
As Bailey rushes to save Adele's life, everyone at the wedding wonders where she is. Arizona tells Callie that she wants to try to have sex for the first time since the plane crash. Cristina and Owen debate whether to go through with the divorce, while a motorcycle gang is brought to the hospital after a car accident. Alex and Jo bond over their similar childhoods in foster care. Meredith and Bailey successfully operate on Adele and Bailey returns to her wedding. Richard shows up after the ceremony and when Meredith walks over he tells her that Adele has died from a heart attack.
183
11 "The End is the Beginning is the End" Cherie Nowlan Joan Rater January 17, 2013 (2013-01-17) 8.80[48]
A decision is reached regarding the plane crash case, with the hospital found guilty of negligence, and each of the survivors is awarded $15 million in compensation. Callie decides to throw a celebration dinner. Jackson performs surgery on Sloan's old patient, and has a disagreement with Arizona over the procedure used. In order to train his hand post-surgery, Derek starts playing ping-pong. Grieving over his wife, Richard has withdrawn, causing the doctors around him to worry. Meredith, Richard and Heather work on a patient who eats her hair as a coping mechanism and to deal with the overbearing mother. At Callie's dinner, Meredith reveals that she's pregnant. Meanwhile, at the hospital, Owen finds out that the insurance company won't pay the crash compensation due to a loophole in the contract and the hospital paying for it would result in bankruptcy.
184
12 "Walking on a Dream" Rob Hardy Tia Napolitano January 24, 2013 (2013-01-24) 9.01[49]
Dr. Alana Cahill, a financial advisor, is hired to find ways to save the hospital money. Meredith tries to deal with unpredictable pregnancy hormones while trying to save the life of a pregnant woman in dire need of a new liver. Arizona, Alex, and Cristina operate on a little girl from the hospital's Africa program. Owen helps Arizona deal with phantom leg syndrome as she begins feeling pain in her no longer existing leg. Derek returns to performing surgeries and operates on an old patient with a brain tumor. April is asked out on a date by a paramedic. Meredith faces her fear of flying when she has to fly to Oregon to get a liver for her patient while dealing with her pregnancy hormones. At a staff meeting, Dr. Cahill explains that the only way to help save the hospital from closing its doors is to shut down the ER.
185
13 "Bad Blood" Steve Robin Jeannine Renshaw January 31, 2013 (2013-01-31) 8.93[50]
As a part of streamlining daily operations, Dr. Cahill has new cameras put in the hospital. Derek and April work together to find a way for the hospital to keep the ER open. Meredith, Bailey, and Richard are given a class on a new technique for hernias, only to learn that the new policies put the number of procedures before patients. Dr. Cahill assists Owen with the case of the ER's final patient. Cristina and Leah work on a young man who is critically injured, but is not given a blood transfusion due to his beliefs as a Jehovah's Witness; Leah is reprimanded when she tries to give him blood in an attempt to save his life. Arizona, Callie, and Alex work on a young gymnast who is depressed following her double hip replacement. It is revealed that Dr. Cahill closed the ER because she's finding a buyer for the hospital.
186
14 "The Face of Change" Rob Greenlea Stacy McKee February 7, 2013 (2013-02-07) 8.91[51]
In order to sell the hospital, Dr. Cahill suggests finding a photogenic doctor to be "the face of the hospital" in the advertising campaign to attract prospective buyers. During a date with Matthew, April rides along on a call to help a badly injured boy; with the nearest ER too far away, they secretly bring him back to Seattle Grace. With Dr. Cahill busy showing the hospital to the prospective buyers, Pegasus, April and the other attendings go behind Chief Hunt's back to pull off the surgery. Meanwhile, Callie and Richard go "undercover" to Portland General, another hospital owned by Pegasus, and learn discouraging things about their management practices, leading to Callie proposing a surprising plan. Alex and Jackson operate on a transgender teenager whose father doesn't want him to transition.
187
15 "Hard Bargain" Tony Phelan William Harper February 14, 2013 (2013-02-14) 8.57[52]
The plane-crash victims discuss whether they should buy the hospital, with everyone but Arizona on board. Derek is mortified when he finds that agreeing to be the new face of the hospital is more than he intended. April goes to Jackson for dating advice. Dr. Bailey and Arizona work on the case of a young cancer patient who is in need of a genome mapping procedure, but the procedure is not approved by Owen due to the new budget constraints. The crash victims learn that Pegasus is due to buy the hospital that night and, led by Derek, resort to drastic measures to prevent the sale.
188
16 "This Is Why We Fight" Jeannot Szwarc Austin Guzman February 21, 2013 (2013-02-21) 8.75[53]
Dr. Cahill convinces Pegasus to resubmit their bid; meanwhile, Meredith, Derek, Cristina, Callie, and Arizona meet up with an investor whose capital is needed to buy the hospital. Heather overhears Dr. Cahill saying that Pegasus is buying the hospital only to liquidate its assets and fire the staff. After being turned down due to lack of management experience, Meredith and Cristina work to get Richard and Owen on board, but a second meeting with the investor also goes poorly. Jackson considers moving to Boston, as the news of liquidation plans spreads. After talking with Richard, Catherine offers the Avery Foundation's investment in the hospital, but only if Jackson sits on the Board of Directors, effectively running the hospital.
189
17 "Transplant Wasteland" Chandra Wilson Zoanne Clack March 14, 2013 (2013-03-14) 8.20[54]
The transition to new management has the doctors at each other's throats, with much of the frustration directed at an equally frustrated Jackson, whom many felt should not be on the board due to his youth and lack of management experience. Matters become worse when Owen quits as chief, leaving the OR board in complete disarray when the attendings are all swamped with surgeries. At the board meeting, Jackson proposes that the hospital be renamed "Grey-Sloan Memorial Hospital" and to reopen the ER.
190
18 "Idle Hands" David Greenspan Gabriel Llanas March 21, 2013 (2013-03-21) 9.39[55]
The ER reopens after extensive remodeling and includes new state-of-the-art technology. Meredith worries that something might be wrong with the baby. Cristina is frustrated when her new administrative duties cut into her medical research time. Callie and Arizona work on improving their sex life. Bailey is pushing for the hospital to sponsor her genome sequencing project. Meredith starts "catastrophizing" about potential congentinal defects before she and Derek find out the sex.
191
19 "Can't Fight This Feeling" Mark Jackson Meg Marinis March 28, 2013 (2013-03-28) 9.02[56]
The hospital is overrun by patients following a gas tanker explosion. Owen bonds with a boy whose parents were both injured in the crash. Meredith takes interest in the case of a boy whose mother believes he is more sick than the tests indicate. Callie prepares for her TED conference speech with help from Arizona. Meredith asks Dr. Bailey to map Zola's genetic history and her genome to check for Alzheimer's genetic markers.
192
20 "She's Killing Me" Nicole Rubio Debora Cahn April 4, 2013 (2013-04-04) 8.58[57]
Meredith and Derek update their wills and healthcare directives when Meredith tests positive for several genetic markers of Alzheimer's. The attendings train two Syrian doctors in performing lifesaving surgeries in the field without much modern equipment, anesthesia or electricity. Derek recognizes that Heather has potential for neurosurgery and focuses on teaching her, much to Shane's chagrin. Owen continues to spend time with the boy whose parents are still in critical condition following the gas tanker crash. Bailey finds herself in hot water when several of her patients are found to have a staph infection.
193
21 "Sleeping Monster" Bobby Roth Bronwyn Garrity April 25, 2013 (2013-04-25) 8.24[58]
The CDC comes to the hospital to investigate the post-op infections in Dr. Bailey's patients. Tensions flare when Jackson doesn't side with the rest of the board in supporting Dr. Bailey. Meredith wants Cristina present during her labor. Matthew asks April to give him a second chance. Alex admits to Cristina that he loves Jo. The CDC investigation concludes that the cause of the infection is in the surgical gloves used during Dr. Bailey's surgeries.
194
22 "Do You Believe in Magic?" Kevin McKidd Dan Bucatinsky May 2, 2013 (2013-05-02) 8.87[59]
Despite being cleared by the CDC, Dr. Bailey locks herself in her lab, feeling betrayed by her colleagues. Meredith and Richard operate on a magician's assistant literally sawed in half during a magic trick gone awry. April and Jackson rekindle their friendship. Owen continues to care for Ethan, whose father is still in a coma. Dr. Lauren Boswell, a craniofacial surgeon, works with Arizona and Jackson on a complex case of a baby whose brain is on the outside of his skull. Alex tries to avoid Jo, but she comes to him for help when her boyfriend physically abuses her.
195
23 "Readiness is All" Tony Phelan William Harper May 9, 2013 (2013-05-09) 8.97[60]
A major storm is heading for Seattle and the hospital is preparing for an influx of patients. Alex brings Jo's boyfriend to the hospital after finding him badly beaten; after being treated, Alex threatens him not to report Jo to the police. Matthew proposes to April. Ethan's father wakes up after nine days in a coma, crushing Owen's dreams of adopting Ethan. Meredith falls down a staircase, but the baby is confirmed to be fine. Dr. Bailey is still hesitant to have contact with patients. Following their surgery, Arizona and Dr. Boswell have a close encounter in an on-call room. As the storm rolls in and the power goes out, Meredith goes into labor.
196
24 "Perfect Storm" Rob Corn Stacy McKee May 16, 2013 (2013-05-16) 8.99[61]
The hospital continues to operate despite the power outage. Meredith requires a C-section, which is performed in the dark; the baby is born healthy, but her earlier fall causes serious abdominal bleeding. Alex, Jo and Arizona must deal with chaos when oxygen machines in the NICU stop working. Cristina operates on Richard's patient by listening to his heart in the dark. The ER staff rush to help the passengers of a burning bus. April questions her engagement to Matthew when she believes that Jackson has died in the bus explosion. Alex tells Jo he loves her, she reciprocates, and they begin a relationship. Callie finds out about Arizona's encounter with Dr. Boswell. Cristina breaks up with Owen. Dr. Bailey returns to the OR when she has to perform emergency surgery on Meredith. While trying to fix the emergency generators and restore the lights, Richard is electrocuted due to the water in the basement.
Ratings[edit]
Live + SD ratings[edit]
No. in
series
No. in
season
Episode
Air date
Time slot (EST)
Rating/Share (18–49)
Viewers (m)
18–49 Rank
Viewership rank
Drama rank
173 1 "Going, Going, Gone" September 27, 2012 (2012-09-27) Thursdays
9:00 P.M.
4.4/12[30]
11.73[30]
6[62]
16[62]
1[62]
174 2 "Remember the Time" October 4, 2012 (2012-10-04)
3.8/10[40]
10.84[40]
6[63]
14[63]
1[63]
175 3 "Love the One You're With" October 18, 2012 (2012-10-18)
3.4/9[41]
9.69[41]
11[64]
21[64]
1[64]
176 4 "I Saw Her Standing There" October 25, 2012 (2012-10-25)
3.0/8[42]
8.76[42]
16[65]
N/A
4[65]
177 5 "Beautiful Doom" November 8, 2012 (2012-11-08)
3.3/8[43]
9.26[43]
9[66]
20[66]
1[66]
178 6 "Second Opinion" November 15, 2012 (2012-11-15)
3.2/8[44]
8.84[44]
10[67]
N/A
1[67]
179 7 "I Was Made for Lovin' You" November 29, 2012 (2012-11-29)
3.1/8[45]
8.95[45]
15[68]
N/A
3[68]
180 8 "Love Turns You Upside Down" December 6, 2012 (2012-12-06)
3.0/8[46]
9.10[46]
13[69]
22[69]
1[69]
181 9 "Run, Baby, Run" December 13, 2012 (2012-12-13)
2.9/8[33]
8.17[33]
16[70]
23[70]
3[70]
182 10 "Things We Said Today" January 10, 2013 (2013-01-10)
3.2/8[47]
9.34[47]
9[71]
18[71]
3[71]
183 11 "The End is the Beginning is the End" January 17, 2013 (2013-01-17)
3.0/8[48]
8.80[48]
13[72]
24[72]
3[72]
184 12 "Walking on a Dream" January 24, 2013 (2013-01-24)
3.0/8[49]
9.01[49]
12[73]
21[73]
2[73]
185 13 "Bad Blood" January 31, 2013 (2013-01-31)
2.8/7[50]
8.93[50]
12[74]
19[74]
5[74]
186 14 "The Face of Change" February 7, 2013 (2013-02-07)
3.1/8[51]
8.91[51]
14[75]
24[75]
4[75]
187 15 "Hard Bargain" February 14, 2013 (2013-02-14)
2.8/7[52]
8.57[52]
11[76]
21[76]
2[76]
188 16 "This Is Why We Fight" February 21, 2013 (2013-02-21)
3.1/8[53]
8.75[53]
13[77]
N/A
2[77]
189 17 "Transplant Wasteland" March 14, 2013 (2013-03-14)
2.6/7[54]
8.20[54]
10[78]
18[78]
2[78]
190 18 "Idle Hands" March 21, 2013 (2013-03-21)
3.0/8[55]
9.39[55]
5[79]
13[79]
3[79]
191 19 "Can't Fight This Feeling" March 28, 2013 (2013-03-28)
2.9/8[56]
9.02[56]
8[80]
16[80]
2[80]
192 20 "She's Killing Me" April 4, 2013 (2013-04-04)
2.8/8[57]
8.58[57]
13[81]
23[81]
2[81]
193 21 "Sleeping Monster" April 25, 2013 (2013-04-25)
2.7/7[58]
8.24[58]
10[82]
22[82]
3[82]
194 22 "Do You Believe in Magic?" May 2, 2013 (2013-05-02)
3.0/9[59]
8.87[59]
7[83]
22[83]
2[83]
195 23 "Readiness is All" May 9, 2013 (2013-05-09)
3.1/9[60]
8.97[60]
8[84]
21[84]
3[84]
196 24 "Perfect Storm" May 16, 2013 (2013-05-16)
3.1/8[61]
8.99[61]
11[85]
18[85]
3[85]
Live + 7 Day (DVR) ratings[edit]
No. in
series
No. in
season
Episode
Air date
Time slot (EST)
18–49 rating increase
Viewers
(millions) increase
Total 18-49
Total viewers
(millions)
Ref
173 1 "Going, Going, Gone" September 27, 2012 (2012-09-27) Thursdays
9:00 P.M.
1.5
3.28
5.9
15.01
[86]
174 2 "Remember the Time" October 4, 2012 (2012-10-04)
1.7
3.49
5.5
14.33
[87]
175 3 "Love the One You're With" October 18, 2012 (2012-10-18)
1.8
3.70
5.2
13.40
[88]
176 4 "I Saw Her Standing There" October 25, 2012 (2012-10-25)
1.9
3.96
4.9
12.72
[89]
177 5 "Beautiful Doom" November 8, 2012 (2012-11-08)
1.9
3.94
5.2
13.20
[90]
178 6 "Second Opinion" November 15, 2012 (2012-11-15)
1.6
3.27
4.8
12.10
[91]
179 7 "I Was Made for Lovin' You" November 29, 2012 (2012-11-29)
1.6
3.42
4.7
12.37
[92]
180 8 "Love Turns You Upside Down" December 6, 2012 (2012-12-06)
1.8
3.75
4.8
12.86
[93]
181 9 "Run, Baby, Run" December 13, 2012 (2012-12-13)
1.6
3.49
4.5
11.70
[94]
182 10 "Things We Said Today" January 10, 2013 (2013-01-10)
1.6
3.46
4.8
12.79
[95]
183 11 "The End is the Beginning is the End" January 17, 2013 (2013-01-17)
1.6
3.24
4.6
12.04
[96]
184 12 "Walking on a Dream" January 24, 2013 (2013-01-24)
1.8
3.65
4.8
12.66
[97]
185 13 "Bad Blood" January 31, 2013 (2013-01-31)
1.7
3.47
4.5
12.40
[98]
186 14 "The Face of Change" February 7, 2013 (2013-02-07)
1.6
3.41
4.7
12.32
[99]
187 15 "Hard Bargain" February 14, 2013 (2013-02-14)
1.7
3.73
4.5
12.32
[100]
188 16 "This Is Why We Fight" February 21, 2013 (2013-02-21)
1.5
3.20
4.6
11.95
[101]
189 17 "Transplant Wasteland" March 14, 2013 (2013-03-14)
1.7
3.64
4.3
11.67
[102]
190 18 "Idle Hands" March 21, 2013 (2013-03-21)
1.5
3.12
4.5
12.50
[103]
191 19 "Can't Fight This Feeling" March 28, 2013 (2013-03-28)
1.5
3.57
4.4
12.59
[104]
192 20 "She's Killing Me" April 4, 2013 (2013-04-04)
1.5
3.27
4.4
11.87
[105]
193 21 "Sleeping Monster" April 25, 2013 (2013-04-25)
1.3
2.92
4.0
11.17
[106]
194 22 "Do You Believe in Magic?" May 2, 2013 (2013-05-02)
1.5
3.16
4.5
12.02
[107]
195 23 "Readiness is All" May 9, 2013 (2013-05-09)
1.5
3.26
4.6
12.23
[108]
196 24 "Perfect Storm" May 16, 2013 (2013-05-16)
1.4
3.05
4.5
12.04
[109]
DVD release[edit]
Grey's Anatomy: The Complete Ninth Season - Everything Changes[110]
Set Details Special Features
24 Episodes (1 extended)
6-Disc Set
English (Dolby Digital 5.1 Surround)
Audio Commentaries
Finale Extended Episode
Spotlight Cast Piece: Jim Pickens, Jr.
Spotlight Character Piece: Arizona Robbins
Deleted Scenes
In Stitches: Season Nine Outtakes
Release Dates
Region 1 Region 2 Region 4
August 27, 2013 [111] November 4, 2013 October 2, 2013
References[edit]
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^ Jump up to: a b c Kondolojy, Amanda (November 9, 2012). "Thursday Final Ratings: 'The Big Bang Theory', 'Vampire Diaries' & 'Grey's Anatomy' Adjusted Up, 'The Office', 'Parks & Rec', 'Scandal' & 'Rock Center' Adjusted Down". TV by the Numbers. Retrieved November 9, 2012.
^ Jump up to: a b c Bibel, Sara (November 16, 2012). "Thursday Final Ratings: 'The Big Bang Theory', 'Vampire Diaries', 'Grey's Anatomy' & 'The Office' Adjusted Up; 'Last Resort & 'Scandal' Adjusted Down". TV by the Numbers. Retrieved November 16, 2012.
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^ Jump up to: a b c Kondolojy, Amanda (December 7, 2012). "Thursday Final Ratings: 'The X Factor', 'The Vampire Diaries' and 'Glee' Adjusted Up; 'Two and a Half Men', 'Elementary', 'Person of Interest' and 'Big Bang Theory' Adjusted Down". TV by the Numbers. Retrieved December 7, 2012.
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^ Jump up to: a b c Kondolojy, Amanda (February 15, 2013). "Thursday Final Ratings: 'Zero Hour', 'Big Bang Theory', 'Community', 'Idol', 'Elementary' & 'Grey's Anatomy' Adjusted Up; 'Scandal' Adjusted Down". TV by the Numbers. Retrieved February 15, 2013.
^ Jump up to: a b c Bibel, Sara (February 22, 2013). "Thursday Final Ratings: 'The Big Bang Theory', 'Parks and Recreation', 'Grey's Anatomy' & 'Elementary' Adjusted Up; 'Beauty and the Beast' Adjusted Down". TV by the Numbers. Retrieved February 22, 2013.
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^ Jump up to: a b c Bibel, Sara (March 22, 2013). "Thursday Final Ratings:'The Vampire Diaries', 'American Idol', 'Grey's Anatomy' & '1600 Penn' Adjusted Up; 'Beauty and the Beast' Adjusted Down". TV by the Numbers. Retrieved March 22, 2013.
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^ Jump up to: a b c Bibel, Sara (April 5, 2013). "Thursday Final Ratings: 'The Big Bang Theory', 'American Idol', 'Grey's Anatomy', 'Two and a Half Men', 'The Office' & 'Wife Swap' Adjusted Up; 'Scandal' & 'The Mindy Project' Adjusted Down". TV by the Numbers. Retrieved April 5, 2013.
^ Jump up to: a b c Kondolojy, Amanda (April 26, 2013). "Thursday Final Ratings: 'The Vampire Diaries', 'The Big Bang Theory' & 'American Idol' Adjusted Up". TV by the Numbers. Retrieved April 26, 2013.
^ Jump up to: a b c Bibel, Sara (May 3, 2013). "Thursday Final Ratings: 'The Big Bang Theory', 'American Idol', 'The Vampire Diaries', 'Two and a Half Men', 'Grey's Anatomy', 'Glee', 'Parks and Recreation' & 'Hannibal' Adjusted Up". TV by the Numbers. Retrieved May 3, 2013.
^ Jump up to: a b c Kondolojy, Amanda (May 10, 2013). "Thursday Final Ratings: 'Big Bang Theory', 'Grey's Anatomy', 'American Idol', 'Vampire Diaries', 'Two and a Half Men', 'Wipeout' & 'Elementary' Adjusted Up; 'Glee' Adjusted Down". TV by the Numbers. Retrieved May 10, 2013.
^ Jump up to: a b c Kondolojy, Amanda (May 17, 2013). "Thursday Final Ratings: 'Hannibal', 'The Big Bang Theory', 'The Vampire Diaries', 'Grey's Anatomy' & 'Office' Retrospective Adjusted Up". TV by the Numbers. Retrieved May 17, 2013.
^ Jump up to: a b c Kondolojy, Amanda (October 2, 2012). "TV Ratings Broadcast Top 25: Sunday Night Football Tops Week 1 Viewing Among Adults 18-49 and With Total Viewers". TV by the Numbers. Archived from the original on November 20, 2014. Retrieved October 2, 2012.
^ Jump up to: a b c Kondolojy, Amanda (October 9, 2012). "TV Ratings Broadcast Top 25: 'Sunday Night Football' Tops Week 2 Viewing Among Adults 18-49, But 'NCIS' Wins With Total Viewers". TV by the Numbers. Archived from the original on October 11, 2012. Retrieved October 9, 2012.
^ Jump up to: a b c Kondolojy, Amanda (October 23, 2012). "TV Ratings Broadcast Top 25: Sunday Night Football Tops Week 4 Viewing Among Adults 18-49 & With Total Viewers". TV by the Numbers. Archived from the original on October 27, 2012. Retrieved October 23, 2012.
^ Jump up to: a b Bibel, Sara (October 30, 2012). "TV Ratings Broadcast Top 25: Sunday Night Football Tops Week 5 Viewing Among Adults 18-49, 'NCIS' Number 1 With Total Viewers". TV by the Numbers. Archived from the original on November 1, 2012. Retrieved October 30, 2012.
^ Jump up to: a b c Bibel, Sara (November 13, 2012). "TV Ratings Broadcast Top 25: Sunday Night Football Again Tops Week 7 Viewing Among Adults 18-49 and is Number 1 With Total Viewers". TV by the Numbers. Zap2it. Retrieved November 13, 2012.
^ Jump up to: a b Bibel, Sara (November 20, 2012). "TV Ratings Broadcast Top 25: Sunday Night Football Again Tops Week 8 Viewing Among Adults 18-49 and is Number 1 With Total Viewers". TV by the Numbers. Zap2it. Retrieved November 20, 2012.
^ Jump up to: a b Kondolojy, Amanda (December 4, 2012). "TV Ratings Broadcast Top 25: Sunday Night Football Tops Week 10 Viewing Among Adults 18-49 and is Number 1 With Total Viewers". TV by the Numbers. Zap2it. Retrieved December 4, 2012.
^ Jump up to: a b c Bibel, Sara (December 11, 2012). "TV Ratings Broadcast Top 25: Sunday Night Football Tops Week 11 Viewing Among Adults 18-49 and is Number 1 With Total Viewers". TV by the Numbers. Retrieved December 11, 2012.
^ Jump up to: a b c Kondolojy, Amanda (December 18, 2012). "TV Ratings Broadcast Top 25: Sunday Night Football Tops Week 11 Viewing Among Adults 18-49 and is Number 1 With Total ViewersTV Ratings Broadcast Top 25: Sunday Night Football Tops Week 12 Viewing Among Adults 18-49 and is Again Number 1 With Total Viewers". TV by the Numbers. Retrieved December 19, 2012.
^ Jump up to: a b c Kondolojy, Amanda (January 15, 2013). "TV Ratings Broadcast Top 25: 'NFL Football Playoffs' Tops Week 15 Viewing Among Adults 18-49 & With Total Viewers". TV by the Numbers. Zap2it. Retrieved January 15, 2013.
^ Jump up to: a b c Bibel, Sara (January 23, 2013). "TV Ratings Broadcast Top 25: 'AFC Championship' Tops Week 17 Viewing Among Adults 18-49 & With Total Viewers". TV by the Numbers. Zap2it. Retrieved January 23, 2013.
^ Jump up to: a b c Kondolojy, Amanda (January 29, 2013). "TV Ratings Broadcast Top 25: 'American Idol' Tops Week 18 Viewing Among Adults 18-49 & With Total Viewers". TV by the Numbers. Zap2it. Retrieved January 29, 2013.
^ Jump up to: a b c Bibel, Sara (February 6, 2013). "TV Ratings Broadcast Top 25: 'Super Bowl' Tops Week 19 Viewing Among Adults 18-49 & With Total Viewers". TV by the Numbers. Zap2it. Retrieved February 6, 2013.
^ Jump up to: a b c Konodjoly, Amanda (February 12, 2013). "TV Ratings Broadcast Top 25: 'Grammy Awards' Tops Week 20 Viewing Among Adults 18-49 & With Total Viewers". TV by the Numbers. Zap2it. Retrieved February 12, 2013.
^ Jump up to: a b c Konodjoly, Amanda (February 20, 2013). "TV Ratings Broadcast Top 25: 'The Big Bang Theory' Tops Week 21 Viewing Among Adults 18-49 & With Total Viewers". TV by the Numbers. Zap2it. Retrieved February 20, 2013.
^ Jump up to: a b Kondolojy, Amanda (February 26, 2013). "TV Ratings Broadcast Top 25: The Oscars Tops Week 22 Viewing Among Adults 18-49 & With Total Viewers". TV by the Numbers. Retrieved February 26, 2013.
^ Jump up to: a b c Bibel, Sara (March 19, 2013). "TV Ratings Broadcast Top 25: 'The Big Bang Theory' Tops Week 25 Viewing Among Adults 18-49 & With Total Viewers". TV by the Numbers. Zap2it. Retrieved March 19, 2013.
^ Jump up to: a b c Kondolojy, Amanda (March 26, 2013). "TV Ratings Broadcast Top 25: 'American Idol' Tops Week 26 Viewing Among Adults 18-49; 'NCIS' Wins With Total Viewers". TV by the Numbers. Zap2it. Retrieved March 26, 2013.
^ Jump up to: a b c Bibel, Sara (April 2, 2013). "TV Ratings Broadcast Top 25: 'The Voice' Tops Week 27 Viewing Among Adults 18-49; 'NCIS' Wins With Total Viewers". TV by the Numbers. Zap2it. Retrieved April 2, 2013.
^ Jump up to: a b c Bibel, Sara (April 9, 2013). "TV Ratings Broadcast Top 25: NCAA Basketball Tops Week 28 Viewing Among Adults 18-49; 'The Big Bang Theory' Wins With Total Viewers". TV by the Numbers. Zap2it. Retrieved April 26, 2013.
^ Jump up to: a b c Bibel, Sara (April 30, 2013). "TV Ratings Broadcast Top 25: 'The Voice' Tops Week 31 Viewing Among Adults 18-49, 'NCIS' on Top With Total Viewers". TV by the Numbers. Zap2it. Retrieved April 30, 2013.
^ Jump up to: a b c Kondolojy, Amanda (May 7, 2013). "TV Ratings Broadcast Top 25: 'Big Bang Theory' Tops Week 32 Viewing Among Adults 18-49, 'NCIS' on Top With Total Viewers". TV by the Numbers. Zap2it. Retrieved May 7, 2013.
^ Jump up to: a b c Kondolojy, Amanda (May 14, 2013). "TV Ratings Broadcast Top 25: 'The Big Bang Theory' Tops Week 33 Viewing Among Adults 18-49, 'NCIS' on Top With Total Viewers". TV by the Numbers. Zap2it. Retrieved May 7, 2013.
^ Jump up to: a b c Bibel, Sara (May 21, 2013). "TV Ratings Broadcast Top 25: 'The Big Bang Theory' Tops Week 34 Viewing Among Adults 18-49, 'NCIS' on Top With Total Viewers". TV by the Numbers. Zap2it. Retrieved May 21, 2013.
Jump up ^ Seidman, Robert (October 14, 2012). "Live+7 DVR Ratings: 'Revolution' Leads Adults 18-49 Ratings and Viewership Gains; 'Grimm' Leads Percentage Gains in Premiere Week". TV by the Numbers. Archived from the original on October 19, 2012. Retrieved October 15, 2012.
Jump up ^ Kondolojy, Amanda (October 22, 2012). "Live+7 DVR Ratings: 'Revolution' Again Leads Adults 18-49 Ratings and Viewership Gains; 'Grimm' Leads Percentage Gains in Week 2". TV by the Numbers. Archived from the original on October 26, 2012. Retrieved October 26, 2012.
Jump up ^ Kondolojy, Amanda (November 5, 2012). "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings and Viewership Gains; 'Grimm' Biggest Percentage Gains in Week 4". TV by the Numbers. Retrieved November 5, 2012.
Jump up ^ Bibel, Sara (November 12, 2012). "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings and Viewership Gains; 'Nikita' Biggest Percentage Gains in Week 5". TV by the Numbers. Retrieved November 12, 2012.
Jump up ^ Bibel, Sara (November 27, 2012). "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings, 'Revolution' Tops Viewership Gains; 'Gossip Girl' Biggest Percentage Gains in Week 7". TV by the Numbers. Zap2it. Retrieved November 27, 2012.
Jump up ^ "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings and Tops Viewership Gains; 'Private Practice' Earns Biggest Percentage Gains in Week 8". Tvbythenumbers.zap2it.com. December 3, 2012. Retrieved December 3, 2012.
Jump up ^ "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings and Tops Viewership Gains; 'Parks and Recreation' Earns Biggest Percentage Gains in Week 10". Tvbythenumbers.zap2it.com. December 17, 2012. Retrieved December 19, 2012.
Jump up ^ "Live+7 DVR Ratings: 'The Big Bang Theory' Leads Adults 18-49 Ratings and Tops Viewership Gains; 'Private Practice' Earns Biggest Percentage Gains in Week 11". Tvbythenumbers.zap2it.com. December 24, 2012. Retrieved December 24, 2012.
Jump up ^ "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings &Viewership Gains; 'Private Practice' Earns Biggest Percentage Gains in Week 12". Tvbythenumbers.zap2it.com. December 31, 2012. Retrieved December 31, 2012.
Jump up ^ Kondolojy, Amanda (January 28, 2013). "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings & Viewership Gains; 'Private Practice' Earns Biggest Percentage Increase in Week 16". TV by the Numbers. Retrieved January 28, 2013.
Jump up ^ Bibel, Sara (February 4, 2013). "Live+7 DVR Ratings: 'Modern Family' Again Leads Adults 18-49 Ratings & Viewership Gains; 'Private Practice' Earns Biggest Percentage Increase in Week 17". TV by the Numbers. Retrieved February 4, 2013.
Jump up ^ Kondolojy, Amanda (February 11, 2013). "Live+7 DVR Ratings: 'Modern Family' Again Leads Adults 18-49 Ratings & Viewership Gains; 'Nashville' Earns Biggest Percentage Increase in Week 18". TV by the Numbers. Retrieved February 11, 2013.
Jump up ^ Bibel, Sara (February 19, 2013). "Live+7 DVR Ratings: 'The Big Bang Theory' Leads Adults 18-49 Ratings Gain; 'Hart of Dixie' Earns Biggest Percentage Increase, 'Elementary' Scores Biggest Viewership Rise in Week 19". TV by the Numbers. Retrieved February 19, 2013.
Jump up ^ Kondolojy, Amanda (February 25, 2013). "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings & Total Viewership Gains; 'Revenge' Earns Biggest Percentage Increase in Week 20". TV by the Numbers. Retrieved February 25, 2013.
Jump up ^ Bibel, Sara (March 4, 2013). "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings & Total Viewership Gains; 'Glee' Earns Biggest Percentage Increase in Week 21". TV by the Numbers. Retrieved March 4, 2013.
Jump up ^ Knodolojy, Amanda (March 11, 2013). "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings & Total Viewership Gains; '90210' Earns Biggest Percentage Increase in Week 22". TV by the Numbers. Retrieved March 11, 2013.
Jump up ^ Knodolojy, Amanda (April 1, 2013). "Live+7 DVR Ratings: 'The Big Bang Theory' Leads Adults 18-49 Ratings & Total Viewership Gains; '90210' Earns Biggest Percentage Increase in Week 25". TV by the Numbers. Retrieved April 26, 2013.
Jump up ^ Knodolojy, Amanda (April 8, 2013). "Live+7 DVR Ratings: 'The Following' Leads Adults 18-49 Ratings Increase; 'Castle' Wins Total Viewership Gains & 'Smash' Earns Biggest Percentage Increase in Week 26". TV by the Numbers. Retrieved April 26, 2013.
Jump up ^ Knodolojy, Amanda (April 15, 2013). "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings Increase & Total Viewership Gains, 'Cult' Earns Biggest Percentage Increase in Week 27". TV by the Numbers. Retrieved April 26, 2013.
Jump up ^ Knodolojy, Amanda (April 22, 2013). "Live+7 DVR Ratings: 'Modern Family' Leads Adults 18-49 Ratings Increase & Total Viewership Gains, 'Grimm' Earns Biggest Percentage Increase in Week 28". TV by the Numbers. Retrieved April 26, 2013.
Jump up ^ Knodolojy, Amanda (May 13, 2013). "Live+7 DVR Ratings: 'The Big Bang Theory' Leads Adults 18-49 Ratings Increase & Tops Total Viewership Gains; 'Smash' Earns Biggest Percentage Increase in Week 31". TV by the Numbers. Retrieved May 13, 2013.
Jump up ^ Bibel, Sara (May 20, 2013). "Live+7 DVR Ratings: 'The Big Bang Theory' Again Leads Adults 18-49 Ratings Increase & Tops Total Viewership Gains; 'Smash' Earns Biggest Percentage Increase in Week 32". TV by the Numbers. Retrieved May 20, 2013.
Jump up ^ Bibel, Sara (May 28, 2013). "Live+7 DVR Ratings: 'The Big Bang Theory' Again Leads Adults 18-49 Ratings Increase & Tops Total Viewership Gains; 'Smash' Earns Biggest Percentage Increase in Week 33". TV by the Numbers. Retrieved May 28, 2013.
Jump up ^ Kondolojy, Amanda (June 3, 2013). "Live+7 DVR Ratings: 'The Big Bang Theory' Again Leads Adults 18-49 Ratings Increase & Tops Total Viewership Gains; '90210' Earns Biggest Percentage Increase in Week 34". TV by the Numbers. Retrieved June 3, 2013.
Jump up ^ Lambert, David (May 23, 2013). "Grey's Anatomy - 'The Complete 9th Season' Press Release Arrives with Extras Listed". TV Shows on DVD. Archived from the original on June 7, 2013. Retrieved May 25, 2013.
Jump up ^ Lambert, David (May 14, 2013). "Grey's Anatomy - Completely Revised Box Art, Possible Earlier Date for 'The Complete 9th Season'". TV Shows on DVD. Archived from the original on June 7, 2013. Retrieved May 14, 2013.
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Isosceles triangle
From Wikipedia, the free encyclopedia
Jump to: navigation, search
"Isosceles" redirects here. For other uses, see Isosceles (disambiguation).
Isosceles triangle
Isosceles triangle with vertical axis of symmetry
Type
triangle
Edges and vertices
3
Schläfli symbol
( ) ∨ { }
Symmetry group
Dih2, [ ], (*), order 2
Dual polygon
Self-dual
Properties
convex, cyclic
In geometry, an isosceles triangle is a triangle that has two sides of equal length. Sometimes it is specified as having two and only two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case.
By the isosceles triangle theorem, the two angles opposite the equal sides are themselves equal, while if the third side is different then the third angle is different.
By the Steiner–Lehmus theorem, every triangle with two angle bisectors of equal length is isosceles.
Contents
[hide]
1 Etymology
2 Terminology
3 Symmetry
4 Acute, right and obtuse
5 Euler line
6 Steiner inellipse
7 Formulas
7.1 Area
8 The isosceles triangle theorem
9 Partitioning into isosceles triangles
10 Miscellaneous
11 Fallacy of the isosceles triangle
12 See also
13 Notes
14 References
Etymology[edit]
The compound is made from "isos"(equal) and skelos (leg).
Terminology[edit]
In an isosceles triangle that has exactly two equal sides, the equal sides are called legs and the third side is called the base. The angle included by the legs is called the vertex angle and the angles that have the base as one of their sides are called the base angles.[1] The vertex opposite the base is called the apex.
Euclid defined an isosceles triangle as one having exactly two equal sides,[2] but modern treatments prefer to define them as having at least two equal sides, making equilateral triangles (with three equal sides) a special case of isosceles triangles.[3] In the equilateral triangle case, since all sides are equal, any side can be called the base, if needed, and the term leg is not generally used.
Symmetry[edit]
A triangle with exactly two equal sides has exactly one axis of symmetry, which goes through the vertex angle and also goes through the midpoint of the base. Thus the axis of symmetry coincides with (1) the angle bisector of the vertex angle, (2) the median drawn to the base, (3) the altitude drawn from the vertex angle, and (4) the perpendicular bisector of the base.[4]
Acute, right and obtuse[edit]
Isosceles right triangle
Whether the isosceles triangle is acute, right or obtuse depends on the vertex angle. In Euclidean geometry, the base angles cannot be obtuse (greater than 90°) or right (equal to 90°) because their measures would sum to at least 180°, the total of all angles in any Euclidean triangle. Since a triangle is obtuse or right if and only if one of its angles is obtuse or right, respectively, an isosceles triangle is obtuse, right or acute if and only if its vertex angle is respectively obtuse, right or acute.
Euler line[edit]
The Euler line of any triangle goes through the triangle's orthocenter (the intersection of its three altitudes), its centroid (the intersection of its three medians), and its circumcenter (the intersection of the perpendicular bisectors of its three sides, which is also the center of the circumcircle that passes through the three vertices). In an isosceles triangle with exactly two equal sides, the Euler line coincides with the axis of symmetry. This can be seen as follows. Since as pointed out in the previous section the axis of symmetry coincides with an altitude, the intersection of the altitudes, which must lie on that altitude, must therefore lie on the axis of symmetry; since the axis coincides with a median, the intersection of the medians, which must lie on that median, must therefore lie on the axis of symmetry; and since the axis coincides with a perpendicular bisector, the intersection of the perpendicular bisectors, which must lie on that perpendicular bisector, must therefore lie on the axis of symmetry.
If the vertex angle is acute (so the isosceles triangle is an acute triangle), then the orthocenter, the centroid, and the circumcenter all fall inside the triangle. If the vertex angle, and therefore the triangle, is obtuse, then the centroid still falls in the triangle's interior, but the circumcenter falls outside it (beyond the base), and the orthocenter also falls outside the triangle (beyond the apex).
In an isosceles triangle the incenter (the intersection of its angle bisectors, which is the center of the incircle, that is, the circle which is internally tangent to the triangle's three sides) lies on the Euler line.
Steiner inellipse[edit]
The Steiner inellipse of any triangle is the unique ellipse that is internally tangent to the triangle's three sides at their midpoints. In an isosceles triangle, if the legs are longer than the base then the Steiner inellipse's major axis coincides with the triangle's axis of symmetry; if the legs are shorter than the base, then the ellipse's minor axis coincides with the triangle's axis of symmetry.
Formulas[edit]
For an isosceles triangle with equal sides of length a and base of length b, the general triangle formulas for (1) the length of the triangle-interior portion of the angle bisector of the vertex angle, (2) the length of the median drawn to the base, (3) length of the altitude drawn to the base, and (4) the length of the triangle-interior portion of the perpendicular bisector of the base all simplify to 1 2 4 a 2 − b 2 . {\displaystyle {\tfrac {1}{2}}{\sqrt {4a^{2}-b^{2}}}.}
For any isosceles triangle with area T and perimeter p, we have[5]:Eq.(1)
2 p b 3 − p 2 b 2 + 16 T 2 = 0. {\displaystyle 2pb^{3}-p^{2}b^{2}+16T^{2}=0.}
Area[edit]
The area of an isosceles triangle can be derived using the Pythagorean Theorem: The sum of the squares of half the base b {\displaystyle b} and the height h {\displaystyle h} is the square of either of the other two sides of length a {\displaystyle a} :
( b 2 ) 2 + h 2 = a 2 {\displaystyle \left({\frac {b}{2}}\right)^{2}+h^{2}=a^{2}} ,
h = 4 a 2 − b 2 2 {\displaystyle h={\frac {\sqrt {4a^{2}-b^{2}}}{2}}} .
By substituting the height, the formula for the area of an isosceles triangle can be derived from the general formula one-half the base times the height:
T = b 4 4 a 2 − b 2 {\displaystyle T={\frac {b}{4}}{\sqrt {4a^{2}-b^{2}}}} .
This is what Heron's formula reduces to in the isosceles case.
If the apex angle ( θ ) {\displaystyle (\theta )} and leg lengths ( a ) {\displaystyle (a)} of an isosceles triangle are known, then the area of that triangle is:
T = 2 ( 1 2 a sin  ( θ 2 ) a cos  ( θ 2 ) ) {\displaystyle T=2\left({\frac {1}{2}}a\sin \left({\frac {\theta }{2}}\right)a\cos \left({\frac {\theta }{2}}\right)\right)}
= a 2 sin  ( θ 2 ) cos  ( θ 2 ) {\displaystyle =a^{2}\sin \left({\frac {\theta }{2}}\right)\cos \left({\frac {\theta }{2}}\right)} .
This is derived by drawing a perpendicular line from the base of the triangle, which bisects the vertex angle and creates two right triangles. The bases of these two right triangles are both equal to the hypotenuse times the sine of the bisected angle by definition of the term "sine". For the same reason, the heights of these triangles are equal to the hypotenuse times the cosine of the bisected angle. Using the trigonometric identity sin  θ = 2 sin  ( θ 2 ) cos  ( θ 2 ) {\displaystyle \sin \theta =2\sin {\left({\frac {\theta }{2}}\right)}\cos {\left({\frac {\theta }{2}}\right)}} , we get
T = 1 2 a 2 sin  θ {\displaystyle T={\frac {1}{2}}a^{2}\sin \theta } ,
which is a special case of the general triangle area formula one-half the product of two sides times the sine of the included angle.
The isosceles triangle theorem[edit]
The theorem which states that the base angles of an isosceles triangle are equal appears as Proposition I.5 in Euclid.[6] This result has been called the pons asinorum (the bridge of asses). Some say that this is probably because of the diagram used by Euclid in his demonstration of the result. Others claim that the name stems from the fact that this is the first difficult result in Euclid, and acts to separate those who can understand Euclid's geometry from those who can't.[7]
Partitioning into isosceles triangles[edit]
For any integer n ≥ 4 {\displaystyle n\geq 4} , any triangle can be partitioned into n {\displaystyle n} isosceles triangles.[8]
In a right triangle, the median from the hypotenuse (that is, the line segment from the midpoint of the hypotenuse to the right-angled vertex) divides the right triangle into two isosceles triangles. This is because the midpoint of the hypotenuse is the center of the circumcircle of the right triangle, and each of the two triangles created by the partition has two equal radii as two of its sides.[9]:p.24
The golden triangle is isosceles and has a ratio of either leg to the base equal to the golden ratio, and has angles 72°, 72°, and 36° in the ratios 2:2:1. It can be partitioned into another golden triangle and a golden gnomon, also isosceles, with ratio of base to leg equaling the golden ratio and with angles 36°, 36°, and 108° in the ratios 1:1:3.[9]:p.30–31
Miscellaneous[edit]
If a cubic equation has two complex roots and one real root, then when these roots are plotted in the complex plane they are the vertices of an isosceles triangle whose axis of symmetry coincides with the horizontal (real) axis. This is because the complex roots are complex conjugates and hence are symmetric about the real axis.
Either diagonal of a rhombus divides it into two congruent isosceles triangles.
The Calabi triangle, which is isosceles, is the unique non-equilateral triangle in which the largest square that fits in its interior can be positioned in any of three different ways.
If an isosceles triangle ABC with equal legs AB and BC has a segment drawn from A to a point D on ray BC, and if the reflection of AD around AC intersects ray BC at E, then BC2 = BD × BE.[10]
There are exactly two distinct isosceles triangles with given area T and perimeter p if the isoperimetric inequality holds strictly as p 2 > 12 3 T . {\displaystyle p^{2}>12{\sqrt {3}}T.} If the inequality is replaced by the corresponding equality, there is only one such triangle, which is equilateral.[5]:Thm.2
If the two equal sides have length a and the other side has length c, then the internal angle bisector t from one of the two equal-angled vertices satisfies[11]:p.169,# η {\displaystyle \eta } 44
2 a c a + c > t > a c 2 a + c {\displaystyle {\frac {2ac}{a+c}}>t>{\frac {ac{\sqrt {2}}}{a+c}}}
as well as[12]
t < 4 a 3 {\displaystyle t<{\frac {4a}{3}}} ;
and conversely, if the latter condition holds, an isosceles triangle parametrized by a and t exists.
Fallacy of the isosceles triangle[edit]
A well known fallacy is the false proof of the statement that all triangles are isosceles. This argument has been attributed to Lewis Carroll,[13] but W.W. Rouse Ball claims priority in this matter.[14] The fallacy is rooted in Euclid's lack of recognition of the concept of betweenness and the resulting ambiguity of inside versus outside of figures.[15]
See also[edit]
Equilateral triangle
Golden triangle, an isosceles triangle with sides in the golden ratio
Isosceles right triangle
Dragon's Eye (symbol)
Scalene triangle
Notes[edit]
Jump up ^ Jacobs 1974, p. 144
Jump up ^ Heath 1956, p. 187, Definition 20
Jump up ^ Stahl 2003, p. 37
Jump up ^ Ostermann & Wanner 2012, p. 55, Exercise 7
^ Jump up to: a b George Baloglou and Michel Helfgott. "Angles, area, and perimeter caught in a cubic", Forum Geometricorum 8, 2008, 13-25. http://forumgeom.fau.edu/FG2008volume8/FG200803.pdf
Jump up ^ Heath 1956, p. 251
Jump up ^ Venema 2006, p. 89
Jump up ^ Lord, N. J. (June 1982), "Isosceles subdivisions of triangles", Mathematical Gazette, 66: 136–137, doi:10.2307/3617750
^ Jump up to: a b Posamentier, Alfred S.; Lehmann, Ingmar (2012). The Secrets of Triangles. Prometheus Books. ISBN 978-1-61614-587-3.
Jump up ^ Dutta, Surajit (2014). "A simple property of isosceles triangles with applications". Forum Geometricorum. 14: 237–240.
Jump up ^ Inequalities proposed in “Crux Mathematicorum”, [1].
Jump up ^ Oxman, Victor (2005). "On the existence of triangles with given lengths of one side, the opposite and one adjacent angle bisectors" (PDF). Forum Geometricorum. 5: 21–22.
Jump up ^ Robin Wilson (2008). Lewis Carroll in Numberland. Penguin Books. pp. 169–170. ISBN 978-0-14-101610-8.
Jump up ^ Ball, W.W. Rouse; Coxeter, H.S.M. (1987) [1892], Mathematical Recreations and Essays (13th ed.), Dover, p. 77 footnote, ISBN 0-486-25357-0
Jump up ^ A description of the fallacy is given in "Fallacy of the Isosceles Triangle".
References[edit]
Heath, Thomas L. (1956), The Thirteen Books of Euclid's Elements, 1 (2nd ed. [Facsimile. Original publication: Cambridge University Press, 1925] ed.), New York: Dover Publications, ISBN 0-486-60088-2
Jacobs, Harold R. (1974), Geometry, W. H. Freeman and Co., ISBN 0-7167-0456-0
Ostermann, Alexander; Wanner, Gerhard (2012), Geometry by Its History, Springer, ISBN 978-3-642-29162-3
Stahl, Saul (2003), Geometry from Euclid to Knots, Prentice-Hall, ISBN 0-13-032927-4
Venema, Gerard A. (2006), Foundations of Geometry, Prentice-Hall, ISBN 0-13-143700-3
Weisstein, Eric W. "Isosceles triangle". MathWorld.
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