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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 co-ordinates of  the points \[A,B,C,D\] be (2, 3, ?1),        (3, 5, ? 3), (1, 2, 3) and (3, 5, 7) respectively, then the projection of \[AB\] on \[CD\] is

    A)            0

    B)            1

    C)            2

    D)            \[\sqrt{3}\]

    Correct Answer: A

    Solution :

               Since AB and CD are perpendicular, therefore projection of AB on CD is 0.


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