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    Question

    The ratio of the curved surface area and the total

    surface area of a cylinder is 5:7, respectively. Find the ratio of the height and radius of the cylinder.
    A 3:2 Correct Answer Incorrect Answer
    B 5:2 Correct Answer Incorrect Answer
    C 4:1 Correct Answer Incorrect Answer
    D 7:5 Correct Answer Incorrect Answer

    Solution

    Let the radius and height of the cylinder be тАШrтАЩ cm2┬аand тАШhтАЩ cm2 Curved surface area = 2╧Аrh cm2 Total surface area = 2╧Аr(h + r) cm2 According to the question, (2╧Аrh):{2╧Аr(h + r)} = 5:7 Or, 7h = 5 ├Ч (h + r) Or, 7h = 5h + 5r Or, 2h = 5r Or, (h/r) = (5/2) Or, h:r = 5:2

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