Free Polygons Calculator - Using various input scenarios of a polygon such as side length, number of sides, apothem, and radius, this calculator determines Perimeter or a polygon and Area of the polygon.
This also determines interior angles of a polygon and diagonals of a polygon as well as the total number of 1 vertex diagonals.

This calculator has 5 inputs.

This calculator has 5 inputs.

- P = n x s
- A = s
^{2}n/4tan(π/n) - Interior Angle Sum = (n - 2) x 180°
- Diagonals = n(n - 3)/2
- 1 vertex Diagonals = n - 3
- Triangles = N - 2
- 5 sides = Pentagon
- 6 sides = Hexagon
- 7 sides = Heptagon
- 8 sides = Octagon
- 9 sides = Nonagon
- 10 sides = Decagon

For more math formulas, check out our Formula Dossier

- apothem
- a line segment from the center to the midpoint of one of its sides
- area
- Number of square units covering the shape
- diagonal
- line segment that goes from one corner to another, but is not an edge
- perimeter
- The distance around a shape or object
- polygon
- A plane figure bounded by a set of straight lines
- radius
- Distance from the center of a circle to the edge

C/2π