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The area of a semicircle of radius 4r is(a) 8πr2 (b) 4πr2 (c) 12πr2 (d) 2πr2 |
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Answer» (a) 8πr2 We know that, area of semicircle = πr2/2 Then, the area of a semicircle of radius 4r is = (π(4r)2)/2 = 16πr2/2 = 8πr2 |
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