Octagon

polygon with eight sides

An octagon or 8-gon is a shape with 8 sides and 8 corners.

An octagon

Regular octagonEdit

All sides of a regular octagon are the same length. Each corner is 135°. All corners added together equal 1080°.

AreaEdit

The amount of space a regular octagon takes up is

{\text{Area}}=2(1+{\sqrt {2}})a^{2}.

a is the length of one of its sides.

Another way to write it is

{\text{Area}}=2a^{2}({\sqrt {2}}+1).

GalleryEdit

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

Related pagesEdit

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