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A closed cylindrical tank of height 1.4 m and radius of the base is 56 cm is made up of a thick metal sheet. How much metal sheet is required ? (Express in square metres).

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Radius of the tank r’ = 56 cm

56/100 m = 0.56m

Height of the tank h = 1.4 m 

T.S.A. of a cylinder = 2πr (r + h)

∴ Area of the metal sheet required = 2πr (r + h)

A = 2 × 22/7 × 0.56 × (0.56 + 1.4)

= 2 × 22 × 0.08 × 1.96 

= 6.8992 m2 

= 6.90 m2

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