Enneadecagon

An enneadecagon or 19-gon is a shape with 19 sides and 19 corners. It is also known as an enneakaidecagon or a nonadecagon.
Regular enneadecagon.
All sides of a regular enneadecagon are the same length. Each corner is ≈161.052°. All corners added together equal 6840°.
The radius of the circumcircle of the "regular enneadecagon" with side length "t" is 
formula_1 (angle in degrees). The area, where "t" is the edge length, is formula_2