An octagon or 8-gon is a shape with 8 sides and 8 corners.
Regular octagon[change | change source]
All sides of a regular octagon are the same length. Each corner is 135°. All corners added together equal 1080°.
Area[change | change source]
The amount of space a regular octagon takes up is
a is the length of one of its sides.
Another way to write it is