Heptagon

Heptagon

Polygon with seven sides.

Each of the interior angles of a regular heptagon measures approximately 128.6°.

Formula

The formula to calculate the area A of a regular heptagon of side length c is:

$A=\frac{7c^{2}}{4}\mathrm{cot}(\frac{\pi}{7} )$

Examples

This heptagon, which is inscribed in a circle, is a regular heptagon:

This heptagon is not a regular heptagon.

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