Maths & numbers
Regular polygon calculator
Find the area, perimeter and radii of a regular polygon.
A clear answer. Here’s how.
Assumes equal sides and equal angles. Perimeter = ns; apothem = s/[2tan(π/n)]; area = perimeter × apothem / 2; circumradius = s/[2sin(π/n)]. Angles shown in degrees.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Number of sides
- 6
- Side length
- 4
Example result
- Perimeter
- 24
- Area
- 41.5692193817
- Apothem
- 3.46410161514
- Circumradius
- 4
- Interior angle
- 120°