InterviewSolution
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InterviewSolution
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T.S.A of a solid hemisphere whose radius is x cm is 147 π cm2. Then ‘x’ is(A) 21 (B) 15 (C) 8 (D) 7 |
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Answer» Correct option is: (D) 7 Radius of hemisphere is x cm. \(\therefore\) Total surface area of the hemisphere = 3 \(\pi x^2\) \(cm^2\) But given that T.S.A of hemisphere is 147\(\pi\) \(cm^2\). \(\therefore\) 3\(\pi x^2\) = 147 \(\pi\) = \(x^2 = \frac {147}3 = 49 = 7^2\) \(\therefore\) x = 7 Correct option is: (D) 7 |
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