Octagon
An octagon or 8-gon is a polygon that has exactly 8 sides.
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
- <math>\text{Area} = 2(1+\sqrt{2})a^2.</math>
a is the length of one of its sides.
Another way to write it is
- <math>\text{Area} = 2 a^2 (\sqrt{2} + 1).</math>
Gallery[change]
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This shape is called an octagram. It has one regular octagon in the middle.
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The octagonal prism has 2 octagons in it: one on the top, and the other on the bottom.
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A non-regular octagon
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Making an octagon by folding paper
