If R = radius of outer circle and r = radius of inner circle, the shaded area can be fround by $A = \frac{1}{4}\pi (R^2 - r^2)$, assuming R and r are given directly or indirectly.

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## Re: How do I work out the area?

of the shaded area sorry

## Re: How do I work out the area?

If R = radius of outer circle and r = radius of inner circle, the shaded area can be fround by $A = \frac{1}{4}\pi (R^2 - r^2)$, assuming R and r are given directly or indirectly.