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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 a line lies in the octant \[OXYZ\] and it makes equal angles with the axes, then [MP PET 2001]

    A)            \[l=m=n=\frac{1}{\sqrt{3}}\]

    B)            \[l=m=n=\pm \frac{1}{\sqrt{3}}\]

    C)            \[l=m=n=-\frac{1}{\sqrt{3}}\]

    D)            \[l=m=n=\pm \frac{1}{\sqrt{2}}\]

    Correct Answer: B

    Solution :

               It is obvious.


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