Heptagon Calculator
Find the area and perimeter of a regular heptagon (7 sides).
A regular heptagon has seven equal sides and angles.
The math behind it
Area = (n/4)·s²·cot(π/n) with n = 7. Each interior angle is about 128.57°.
Worked example
Side 6 → area ≈ 130.83, perimeter 42.
FAQ
Can a heptagon be constructed with compass and straightedge?
No — the regular heptagon is famously impossible to construct that way.