A copper plate of diameter 18cm is drawn into a wire of diameter 4cm. Find the length of wire
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d=18 cm d=4 cm
r=90 cm R=2 cm
volume of copper plate = volume of cylinder wire
4/3πr^3 = π R^2 h
4*(90)^3/ 3*(2)^2 = h= 243000 mm
l= 243 m
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