the area enclosed between two concentric circles, Mathematics

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the area enclosed between two concentric circles

The area enclosed between two concentric circles is 770cm². If the radius of the outer circle is 21cm, find the radius of the inner circle. (Ans :14cm)

Ans: Π R² - Π r² = 770
Π (212 - r²) = 770

212 - r² = 770/22 x 7 = 70/2 x 7

r² =441 -490/2= 441 - 245=196

r= ± 14
r=14cm

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