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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) 4 \pi r^{2}                      (B) 6 \pi r^{2}                  (C) 3 \pi r^{2}                      (D) 8 \pi r^{2}

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            The radius of hemisphere = r

      \text{ Curved surface area} =2 \pi r^{2}

            The curved surface area of two solid hemisphere

                        =2 \times 2 \pi r^{2}

                        =4 \pi r^{2}

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