Question

The area closed between the concentric circles is 770cm².if the radius of the outer circle is 21cm calculate the radius of the inner circle ​

Answer 1

Answer:

outer radius(R)=21 cm

let inner radius be r

π(R^-r^) = 770

R^-r^ = 770 × 7/ 22

r^= 21^ -245

r^=441-245

r^=196

r=14 cm

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Answer 2

Answer:

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