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.

## Formula

- 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

## Polygon

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.a^{2}.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**.