If two solid hemispheres of same base radius r are joined together along their bases, then curved surface area of this new solid is ______.

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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 4$\pi$r2. Explanation: Because curved surface area of a hemisphere is 2$\pi$r2 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$\pi$r2 + 2$\pi$r2 = 4$\pi$r2.

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