JEE Main & Advanced Mathematics Three Dimensional Geometry Question Bank Plane

  • question_answer
    The value of \[aa'+\,bb'+\,cc'\]being negative the origin will lie in the acute angle between the planes \[an+by+cz+d=0\] and \[a'x+b'y+c'z+d'=0\], if [MP PET 2003]

    A)            \[a=a'=0\]                                 

    B)            d and \[d'\]are of same sign

    C)            d and \[d'\]are of opposite sign

    D)            None of these

    Correct Answer: B

    Solution :

               It is obvious.

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