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Hendecagon

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A hendecagon

A hendecagon or undecagon or 11-gon is a shape with 11 sides and 11 corners.

Regular hendecagon

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All sides of a regular hendecagon are the same length. Each corner is 147.27°. All corners added together equal 1619.97°.

The amount of space a regular hendecagon takes up is

a is the length of one of its sides.