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Question

 If two solid-hemisphere s 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


Solution

Base radius of the hemisphere = r
Since the two hemispheres are joined end to end, it becomes a complete sphere. 
Curved surface area of the new solid = total surface area of the sphere.
Curved surface area of the new solid=4πr2

Hence, the correct answer is option (a).

Mathematics
RD Sharma (2016)
Standard X

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