How do I work out the area?

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Nerrkolas
How do I work out the area?

arch.png

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Nerrkolas

of the shaded area sorry

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Jhun Vert
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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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