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    5. A right circular cone has a radius of 9 cm and a height of 12 cm. Find the curved surface area of th

    Question

    A right circular cone has a radius of 9 cm and a height

    of 12 cm. Find the curved surface area of this cone.
    A 124π sq cm Correct Answer Incorrect Answer
    B 180π sq cm Correct Answer Incorrect Answer
    C 135π sq cm Correct Answer Incorrect Answer
    D 144π sq cm Correct Answer Incorrect Answer

    Solution

    Slant height of the cone = √{(radius)2 + (height)2} = √(92 + 122) = √(81 + 144) = √225 = 15 cm So, curved surface area of the cone = π X radius X slant height = 135π cm2

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