A) \[\pi ({{R}^{2}}+3{{r}^{2}})\]
B) \[\pi (3{{R}^{2}}+{{r}^{2}})\]
C) \[\pi (3{{r}^{2}}+2{{R}^{2}})\]
D) \[\pi (2{{r}^{2}}+3{{R}^{2}})\]
Correct Answer: B
Solution :
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