Regular Polygons

Calculate areas and perimeters of regular polygons with 3 to 12 sides. Regular polygons are polygons with equal sides and equal angles.

Calculator

Inputs

Number of Sides (n)

Side Length (a) (m)

Results

Perimeter (P)-- m

Area (A)-- m²

Polygon	Number of Sides (n)	Area Coefficient (A/a²)
Triangle, equilateral	3	0.433
Square	4	1
Pentagon	5	1.7205
Hexagon	6	2.5981
Heptagon	7	3.6339
Octagon	8	4.8284
Nonagon	9	6.1818
Decagon	10	7.6942
Undecagon	11	9.3656
Dodecagon	12	11.1961

Regular Polygons | MEPKit Engineering Tools | MEPKit