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    Question

    The height of a right circular cylinder is 12m and also

    three times the sum of the areas of its two end faces is equal to twice the area of its curved surface. The radius of its base, in metre is?┬а
    A 12 m Correct Answer Incorrect Answer
    B 8 m Correct Answer Incorrect Answer
    C 4 m Correct Answer Incorrect Answer
    D 6 m Correct Answer Incorrect Answer

    Solution

    Height = 12cm,┬а Area of two end faces of right circular cylinder = (2╧Аr2) Curved surface area of right circular cylinder = 2╧Аrh according to question, 3 x (2╧Аr2) = 2 x (2╧Аrh) 3 x r = 2h r = (2├Ч12)/3┬а┬а r = 8 m

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