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A closed cylindrical tank of radius 7 m and height 3 m is made from a sheet of metal. How much sheet of metal is required?

A closed cylindrical tank of radius 7 m and height 3 m is made from a sheet of metal. How much sheet of metal is required?

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Total surface area of cylinder = 2πr (h + r)

                                              = 2\Pi \times7(7+3) = 14\Pi \times10 = 440\ m^2

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