Area of a Circle Calculator

How to find the area of a circle.

Result

A ≈ 50.265482457437

r — 4

A = π · 4² ≈ 50.265482457437

Examples:

A = πr²

Where:
A — area of circle
r — radius of circle
π — the number π (mathematical constant, 3.1415926535898)

You need to multiply the π value by the radius (r) in square. For example, if r is 2 do the following;