Area and Dimensions of a Circular Ring

Please enter r or d and R or D.
r
d
R
D


Area =  

Formulas:

A = Area
R = Outer Radius
D = Outer Diameter
r = Inner Radius
d = Inner Diameter
A = p * (R2 - r2)
A = 3.1416 * (R2 - r2)
A = 0.7854 * (D2 - d2)

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