Area and Perimeter > Polygon

Area and Perimeter: Polygon

This online calculator is a free online tool to help you in calculate area and perimeter of Polygon.


Enter the number of edges (number of angles)

n =

Enter 1 value

edges (a) =
radius K (R) =
radius k (r) =
Round to decimal places.
Area A =
Perimeter P =


Polygon Area and perimeter of a polygon
  • P – perimeter
  • A – area
  • R – radius K
  • r – radius k
  • n – number of edges
  • O – centre
  • a – edges
  • K – circumscribed circle
  • k – inscribed circle

You may need: Hexagon


In geometry and mathematics, polygon is a flat or plane shaped, two-dimensional shape, closed shape with the straight sides. Polygon does not have a curve side. Polygons that have equal sides and congruent angles are called as Regular Polygon. Some examples of regular polygon are triangle, rectangle, hexagon, and pentagon.

The standard formula to count the Area of Polygon

A=1/4.n.a2.cot π/n
n= number of side/edges
a= side length/edges

The standard formula to count the Perimeter of Polygon

P= n.a
P = perimeter
n= number of side/edges
a = side length/edges

The Instruction to use the Calculator Online to calculate the Area and Perimeter of Polygon

1. First, input 2 values between (n) number of side/edges and (a) edges of polygon, (n) number of side/edges and (R) Radius K or (n) number of side/edges and (r) Radius k.
2. Next, you can choose what decimal places you need. It can 1 or 2 or whatever you want.
3. And then, click “Calculate Button” and the answer will automatically appear.
4. To count another number, just repeat the first step.

Example of the usage of calculator online to count the Area and Perimeter of Polygon

1. Example, enter "12" in "n"/number of side/edges and “5” in “a”/edges.
2. Then click enter or “Calculate” button.
3. You will find the answer right there on the Area A column and Perimeter P column. The area is 279.90 and the Perimeter is 60.00.