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If two solid hemispheres of same base radius r are joined together along their bases, then curved surface area of this new solid is(a) 4πr2 (b) 6πr2 (c) 3πr2 (d) 8πr2 |
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Answer» The correct option is (a) 4πr2. Explanation: Because curved surface area of a hemisphere is 2 w2 and here, we join two solid hemispheres along their bases of radius r, from which we get a solid sphere. Hence, the curved surface area of new solid = 2 πr2 + 2 πr2 = 4πr2. |
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