Area of a Circular Ring - Geometry Calculator

Online calculator to calculate the enclosed area (in blue) of a circular ring when outer and inner radii are known.

How to use the calculator

Enter the outer and inner radii R1 and R2 (with R1 > R2) as positive real numbers and press "enter". The output is the area of the circular ring.

R1 =
R2 =
area =

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Updated: February 2015

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