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.
