Area of a Circle

Area of a Circle

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

Formula

A = pi*r^2, A: area of a circle, pi: 3.141592..., r: radius

A = πr2

A: area of a circle
π: 3.141592...
r: radius

Example 1

Find the area of the given circle. r = 5.

r = 5

A = π⋅52

Example 2

Find the area of the given circle. d = 13.

d = 13r = 13/2

A = π⋅(13/2)2