A) \[30\,\pi \,\,{{m}^{2}}\]
B) \[40\,\pi \,\,{{m}^{2}}\]
C) \[50\,\pi \,\,{{m}^{2}}\]
D) \[60\,\pi \,\,{{m}^{2}}\]
E) None of these
Correct Answer: D
Solution :
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