A) \[\frac{4}{3}\pi {{r}^{2}}\]
B) \[4\pi {{r}^{2}}\]
C) \[\pi {{r}^{2}}\]
D) \[2\,\pi {{r}^{2}}\]
Correct Answer: B
Solution :
Height of the cylinder = diameter of sphere\[=2r\]. Curved surface of cylinder \[=2\pi \times radius\times height\] \[=2\pi \times r\times 2r\] \[=4\pi \,{{r}^{2}}\]
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