Pentadecagon

A pentadecagon or quindecagon or 15-gon is a shape with 15 sides and 15 corners.
Regular pentadecagon.
All sides of a regular pentadecagon are the same length. Each corner is 156°. All corners added together equal 2340°.
Area.
The amount of space a regular pentadecagon takes up is
"a" is the length of one of its sides.
Uses.
&lt;br&gt;A regular triangle, decagon, and pentadecagon can completely fill a plane vertex.