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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 co-ordinates of the point P are \[(x,y,z)\]and the direction cosines of the line OP when O is the origin, are \[l,\,m,\,n\]. If \[OP\], then

    A)            \[l=x,\,m=y,\,n=z\]

    B)            \[l=xr,m=yr,n=zr\]

    C)            \[x=lr,\,y=mr,\,z=nr\]

    D)            None of these

    Correct Answer: C

    Solution :

               It is obvious.


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