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    Question

    A cone has a radius of 18 cm and its curved surface area is

    1980 cm². Find its height.
    A 12 cm Correct Answer Incorrect Answer
    B 36 cm Correct Answer Incorrect Answer
    C 30 cm Correct Answer Incorrect Answer
    D 15 cm Correct Answer Incorrect Answer

    Solution

    Let slant height of the cone be ‘l’ cm

    So, (22/7) × 18 × l = 1980

    Or, l = 35 cm

    So, height of the cone (h) = √{35² – 18²} = 30 cm

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