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Question -

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



Answer -

Area ofmetal sheet required = Total surface area of the cylindrical tank = 2πr(h + r)
= 2 ×22/7 × 7(3 + 7)
= 2 ×22/7 × 7 × 10
= 440 m2
Hence, the required area of sheet = 440 m2.

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