Q1 of 20 Page 225

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 meters)

Given, radius of the base of a cylinder r = 56cm = 0.56m

And height h = 1.4m


To find the metal sheet required, we need to find the total surface area of the cylinder.


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


= 2 × π × 0.56 × (0.56 + 1.4)


= 6.89 ≃ 6.9m2


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