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    5. The radius of a cone is 10.5 cm and the area of the curved surface is 396 cm². Find it's slant heig

    Question

    The radius of a cone is 10.5 cm and the area of the

    curved surface is 396 cm². Find it's slant height. Take π = 22/7
    A 9 cm Correct Answer Incorrect Answer
    B 11.5 cm Correct Answer Incorrect Answer
    C 12 cm Correct Answer Incorrect Answer
    D 8.5 cm Correct Answer Incorrect Answer

    Solution

    Radius =10.5cm. Curved surface area =396 cm² Curved surface area= π  rl 22/7 ×10.5×l =396 l =18×7/10.5 =12cm

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