Regular Polygon Calculator
Enter the number of sides (n) and one side's length — get the area, perimeter, interior/exterior angle, apothem and circumradius of any regular polygon like pentagon (5), hexagon (6) or octagon (8). Diagram help: the apothem is the straight line from the center to the middle of any side.
Enter values — the result will show live here.
How to use
- Enter the number of sides (at least 3) and one side's length.
- All results appear together: perimeter, apothem, area and all three angles.
Note: Formulas: Interior angle = (n - 2) x 180 / n, Apothem = side / (2 tan(pi/n)), Area = (perimeter x apothem) / 2. In a regular polygon all sides and angles are equal.