Work out heptagon area instantly with clear inputs, formula shown and shareable results.
A regular heptagon has 7 equal sides. Splitting it into 7 isosceles triangles from the centre gives A = 7s² / (4·tan(π/7)), which evaluates to (7/4)·cot(π/7)·s² ≈ 3.633912·s².
Area
A = 7s² / (4·tan(π/7)) = (7/4)·cot(π/7)·s² ≈ 3.633912·s²
Apothem
a = s / (2·tan(π/7))
(7 − 2) × 180° / 7 = 128.57°.
Yes. For an irregular heptagon use the shoelace formula on its vertex coordinates instead.