Find the number of coins,1.5cm in diameter and 0.2cm thick,to be metled to form a right circular cylinder with a height of 10cm and a diameter of 4.5cm.
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Vol. of Cylinder = pi * r^2 * h
Vol of coin = pi * 0.75^2 * 0.2 = 0.1125 cm^3
Vol of Cyl = pi * 2.25^2 * 10 = 50.625 cm^3
Assume n coins are required then,
n * pi * 0.75^2 * 0.2 = pi * 2.25^2 * 10
n = 450 coins are required to form the right circular cylinder.
Vol of coin = pi * 0.75^2 * 0.2 = 0.1125 cm^3
Vol of Cyl = pi * 2.25^2 * 10 = 50.625 cm^3
Assume n coins are required then,
n * pi * 0.75^2 * 0.2 = pi * 2.25^2 * 10
n = 450 coins are required to form the right circular cylinder.
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6
hence we get that to make a cylinder 450 coins are needed
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