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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
    The direction cosines of the line \[x=y=z\] are [MP PET 1989]

    A)            \[\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}},\frac{1}{\sqrt{3}}\]

    B)            \[\frac{1}{3},\frac{1}{3},\frac{1}{3}\]

    C)            1, 1, 1

    D)            None of these

    Correct Answer: A

    Solution :

               Direction cosines \[\left( \frac{1}{\sqrt{3}},\,\,\frac{1}{\sqrt{3}},\,\frac{1}{\sqrt{3}} \right)\].


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