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.
Figure 1. Formula for area of circular ring
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.
More References and links
Online Geometry Calculators and Solvers.