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Question
If two solid hemispheres of same base radius r units are joined together along with their bases, then the curved surface area of this new solid is ______.
Options
4πr2 sq.units
6πr2 sq.units
3πr2 sq.units
8πr2 sq.units
Solution
If two solid hemispheres of same base radius r units are joined together along with their bases, then the curved surface area of this new solid is 4πr2 sq.units.
Explanation:
Because a hemisphere's curved surface area is, we unite two solid hemispheres along their bottoms of radii r to form a solid sphere.
Hence the curved surface area of new solid = 2πr2 + 2πr2 = 4πr2
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