# Area of a Circle

How to find the area of a circle: formula, examples, and their solutions.

## Formula

*A* = *πr*^{2}*A*: Area of a circle*π* = 3.141592...*r*: Radius of a circle

## Example 1

*r* = 5

So *A* = *π*⋅5^{2}.

5^{2} = 25

So *A* = 25*π*.

## Example 2

*d* = 13

So *r* = 13/2.

Then *A* = *π*⋅(13/2)^{2}.

(13/2)^{2} = 13^{2}/2^{2}

Power of a quotient

13^{2} = 169

2^{2} = 4

So *A* = (169/4)*π*.