Hendecagon

A hendecagon or undecagon or 11-gon is a shape with 11 sides and 11 corners.

 Regular hendecagon 
All sides of a regular hendecagon are the same length. Each corner is 147.27°. All corners added together equal 1619.97°.

 Area 
The amount of space a regular hendecagon takes up is



a is the length of one of its sides.

11