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Question

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?


A

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

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B

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

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C

Total surface area of coin + total surface area of cone

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D

Total surface area of cone

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Solution

The correct option is B

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


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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