Octagon
polygon with eight sides
An octagon or 8-gon is .
Regular octagon change
All sides of a regular octagon are the same length. Each corner is 135°. All corners added together equal 1080°.
Area change
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
Gallery change
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This shape is called an octagram. It has one regular octagon in the middle. -
The octagonal prism has 2 octagons in it: one on the top, and the other on the bottom. -
A non-regular octagon -
Making an octagon by folding paper
