Heptagon

shape with seven sides

A heptagon/septagon or 7-gon is a shape with 7 sides and 7 corners.

A heptagon

Regular heptagon

change

All sides of a regular heptagon are the same length. Each corner is about 147.27°. All corners added together are about equal to 6840°.

The amount of space a regular heptagon takes up is

 

a is the length of one of its sides.