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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