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  1. The radius of a cylinder is 2 r units and height is 3 r units. Find the curved surface?
    2. A.
    18 πr2 sq units
    B.
    3 πr2 sq units
    C.
    12 πr2 sq units
    D.
    6 πr2 sq units

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    Answer : Option C

    Explanation :

    2 * π * 2r * 3r = 12 πr2

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