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Q.

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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Detailed Solution

Radius of cylindrical tank, r = 7 m 

Height of cylindrical tank , h = 3 m

Area of metal 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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