Tetracontagon

A tetracontagon or 40-gon is a shape with 40 sides and 40 corners.
Regular tetracontagon.
All sides of a regular tetracontagon are the same length. Each corner is 171°. All corners added together equal 6840°.
Area.
The amount of space a regular tetracontagon takes up is
"a" is the length of one of its sides.