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Question

What will be the radius of a circle whose area is 9 times the area of another circle with diameter 8cm?


A

88 cm

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B

70cm

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C

72.51cm

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D

75.36cm

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Solution

The correct option is D

75.36cm


Let r1 be the required radius.

Given, πr21 = 9πr22 (r2=4, given)

πr21 = 9π42

r21 = 144

r1 = 12 cm


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