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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 ratios of the line joining the points (4, 3, ?5) and (?2, 1, ?8) are               [AI CBSE 1984; MP PET 1988]

    A)            \[\frac{6}{7},\frac{2}{7},\frac{3}{7}\]

    B)            \[6,\,\,2,\,\,3\]

    C)            \[2,\,\ 4,\ -13\]

    D)            None of these

    Correct Answer: B

    Solution :

               Direction ratios are, \[l=4-(-2)=6,\,\,m=3-1=2\] and \[n=-\,5+8=3\]..


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