Area and Perimeter of a Circle - Geometry Calculator


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

P = 2 * Pi * r


A = Pi * r 2

How to use the calculator

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

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Updated: 2 April 2013

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