Regular Polygon Calculator
Interior angle, perimeter, area, apothem of a regular n-gon.
120°
Interior angle
60°
Exterior angle
6
Perimeter
2.5981
Area
0.866
Apothem
1
Circumradius
About this tool
Enter the number of sides and side length — the tool returns every standard regular-polygon measurement: interior / exterior angles, perimeter, area, apothem and circumradius.