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JEE Main & Advanced Mathematics Three Dimensional Geometry Question Bank System of Co-ordinates, Direction cosines and direction ratios, Projection

  • question_answer
    If the projections of a line on the co-ordinate axes be           2, ?1, 2, then the length of the lines is

    A)            3

    B)            4

    C)            2

    D)            \[\frac{1}{2}\]

    Correct Answer: A

    Solution :

               \[r=\sqrt{4+1+4}=3\].


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