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Surface area of a solid

A solid is co...

Question

A solid is composed of a cylinder with hemispherical ends. If the length of the whole solid is 108 cm and the diameter of the cylinder is 36 cm, find the cost of polishing the surface at the rate of 7 paise per cm². (Use π = 3.1416)

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Solution

Height of the cylinder

C.S.A. of cylinder

C.S.A. of 2 hemisphere = surface of a sphere

Total surface

Total cost

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Surface area of a solid

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