There is a coin. Ram attaches a conical attachment to one flat end of coin. The

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There is a coin. Ram attaches a conical attachment to one flat end of coin. The conical attachment has same radius as coin. What is the surface area of the combined solid?

Options:

A . Coin base area + Coin C.S.A + Hemisphere C.S.A

B . Coin base area + Coin C.S.A + cone C.S.A

C . Total surface area of coin + total surface area of cone

D . Total surface area of cone

Answer: Option B
:
B
This leaves only the following surfaces for the combined solid-
1. One flat surface of coin
2. Curved surface of coin
3. Curved surface area of cone
These 3 areas add up together to give total surface area of combined solid.

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