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    Question

    If the volume of a cylinder is 400π and the ratio of

    radius to its height is 5:2 then find the curved surface area of cylinder?
    A 24π unit² Correct Answer Incorrect Answer
    B 80π unit² Correct Answer Incorrect Answer
    C 60π unit² Correct Answer Incorrect Answer
    D 56π unit² Correct Answer Incorrect Answer
    E 48π unit² Correct Answer Incorrect Answer

    Solution

    Volume of cylinder = 400π ⇒ πr2h = 400π ⇒ r2h = 400 units ⇒ 25x2*2x = 400 units ⇒ x3 = 8 ⇒ x = 2 Radius = 10 units & height = 4 units. Curved surface area = 2πrh Curved surface area = 80π unit ²

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