Question

Area of a ring formula

Answer 1

Answer:

area of circle =πr^2

hope it helps you

Answer 2

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$Area \: of \: ring \\ = \pi \: R{}^{2} - \pi \: r {}^{2} \\ = \pi(R{}^{2} - r {}^{2} ) \\ = \pi \: ( R + r)(R - r)$