Discussion
If two solid hemispheres of the same base radius r are joined together along their bases, then curved surface area of this new solid is
Answer: A
Joining two hemispheres along their bases produces a complete sphere; the two flat circular faces are sealed inside and no longer form part of the surface.
\[ 2 \times 2\pi r^{2} = 4\pi r^{2} \]
which is precisely a sphere's surface area. Adding the two flat faces would give \( 6\pi r^{2} \) - correct for two separate hemispheres, but not for the joined solid.
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