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    Question

    The cross sectional area of a hemisphere is 2772 cm²

    and its volume is 19404 cm³. What is its radius?
    A 21 cm Correct Answer Incorrect Answer
    B 22.5 cm Correct Answer Incorrect Answer
    C 42 cm Correct Answer Incorrect Answer
    D 13 cm Correct Answer Incorrect Answer

    Solution

    As we know, Volume of hemisphere = (2/3) πr3 (2/3) πr³ = 19404 --- (1) The curved surface area of the hemisphere = 2 πr² 2 πr² = 2772       …   (2) Dividing (1) by (2),   [(2/3) πr³]/ [2 πr²] = 19404/2772   r/3 = 7 r = 21 cm

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