find number of coins , 1.5 cm in diameter and 0.2cm thick,to be melted to from a right circular cylinder of height 10 cm and diameter 4.5 cm
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Coins :
D = 1.5 cm
H = 0.2 cm
Vol = π r² h
= π * 1.5/2 * 1.5/2 * 0.2
Cylinder :
D = 4.5 cm
H = 10 cm
Vol = π r² h
= π * 4.5/2 * 4.5/2 * 10
No. of coins = Vol. of cylinder / Vol. of coin
= π * 4.5 * 4.5 * 10 * 2 * 2 / π * 1.5 * 1.5 * 0.2 * 2 * 2
= 450 coins
D = 1.5 cm
H = 0.2 cm
Vol = π r² h
= π * 1.5/2 * 1.5/2 * 0.2
Cylinder :
D = 4.5 cm
H = 10 cm
Vol = π r² h
= π * 4.5/2 * 4.5/2 * 10
No. of coins = Vol. of cylinder / Vol. of coin
= π * 4.5 * 4.5 * 10 * 2 * 2 / π * 1.5 * 1.5 * 0.2 * 2 * 2
= 450 coins
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