Radius of a solid copper cylinder is 4.2 cm and it's height is 16 cm. How many disc of diameter 1.4 cm and thickness 0.2 cm can be made from this cylinder melting it.
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Step-by-step explanation:
Area of cylinder : pi x r^2 x height
3.142 x 17.64 x 16
886.68 cm2
Area of disc : pi x r^2 x height
3.142 x 0.49 x 0.2
0.308 cm2
Number of discs : 886.68 / 0.308 = 2880 discs
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