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By Anonymous

Tags: Circle, Area, Radius, Root, Pi, Diameter, Circumference

0

Posted: 2013-11-11
Radius of a Circle from its Area
Radius of a Circle from its Area
$$r = \sqrt{A \over \pi}$$

If you need to find the Radius ($r$) of a circle, and only have the Area ($A$) to work with, you can use this handy formula.

If you have the Circumference, use this formula: www.automathic.org/152_radius-of-a-circle