Find the number of coins 2.1cm in diameter and 3mm thick to be meltedto form a right circular cylinder of height 12cm and diameter 7cm.
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- Change 3mm to cm ie 0.3 cm
- calculate the volume of the coin first .
Volume of Coin = πr2h
22/7×2.1/2×2.1/2×0.3=1.0395cm2
3. Now calculate the volume of cylinder
Volume of cylinder =πR2H
22/7×3.5×3.5×12=462cm2
4. No of coins melted to form a right cylinder of height 12cm and diameter 7cm= Volume of cylinder / Volume of coins
=462/1.0395= 444 Approx
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