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Q.

The radii of two concentric circles are 68 cm and 22 cm. The area of the closed figure bounded by the boundaries of the circles is

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a

4080π sq. cm. 

b

4140π sq. cm. 

c

4050π sq. cm. 

answer is A.

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Detailed Solution

Question Image

 Required Area =π(68)2π(22)2

(4624π484π)4140π cm2

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The radii of two concentric circles are 68 cm and 22 cm. The area of the closed figure bounded by the boundaries of the circles is