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Formula Circle Area    Radius   

Formula
Formula: Circle
Circle with drawn in Radius

Area

Unit
Area of a circle with radius \(r\).

Radius

Unit
Radius of the circle. The diameter \(d\) of the circle is \( d = 2r\).

Pi

Unit
Pi is a mathematical constant and has the value \( \pi ~=~ 3.1415926... \)