Question

Ramu was stacking ₹1 coins as a tower. What could be the volume, if Ramu stacked 50 ₹1 coins as a tower?

• 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 1

The correct option is D

Total surface area of cone

The tower that Ramu made is a cylinder.

The volume occupied by single coin = Coin base area $\times$ thickness of a coin.

Since there are 50 such coins, then the volume of the coin tower is 50 $\times$ coin base area $\times$ thickness of a coin.