Area and Perimeter of a Circle - Geometry Calculator

An online calculator to calculate the area A and perimeter P of a circle given its radius r. The formulas for the perimeter P and area A of a circle are given by:

P = 2 π r

A = π r 2

How to use the calculator

Enter the radius r as a positive real number and press "calculate". The outputs are the area and perimeter of the circle.

r =

P =
A =

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Updated: February 2015

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