What is the total surface area of a hollow hemisphere of external and

1.	What is the total surface area of a hollow hemisphere of external and internal radii R and r?
A.	\[\pi ({{R}^{2}}+3{{r}^{2}})\]
B.	\[\pi (3{{R}^{2}}+{{r}^{2}})\]
C.	\[\pi (3{{r}^{2}}+2{{R}^{2}})\]
D.	\[\pi (2{{r}^{2}}+3{{R}^{2}})\]
Answer» C. \[\pi (3{{r}^{2}}+2{{R}^{2}})\]

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What is the total surface area of a hollow hemisphere of external and internal radii R and r?

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