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    Question

    A cylindrical pencil of diameter 1.2 cm has one of its

    end sharpened into a conical shape of height 1.4 cm. The volume of the material removed is
    A 1.056 cm3 Correct Answer Incorrect Answer
    B 4.224 cm3 Correct Answer Incorrect Answer
    C 10.56 cm3 Correct Answer Incorrect Answer
    D 42.24 cm3 Correct Answer Incorrect Answer

    Solution

    = ╧Аr2h тАУ 1/3 ╧Аr2 h = 2/3 ╧Аr2 ┬а {r = (1.2/2) = 0.6, h = 1.4} 2/3 ├Ч 22/7 ├Ч 0.62 ├Ч 1.4 = 2 ├Ч 22 ├Ч 0.2 ├Ч 0.2 ├Ч 0.6 = 1.056 cm3

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