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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?

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

= [ 2 x (22/7) x 7(7 + 3) ] m2

= 440 m2

Thus, 440 m2 sheet of metal is required.

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