Rani 1 Asked a Question
September 26, 2021 11:04 pmpts 1 pts
AP AB xAC |=0 Prove that the four points A, B, C and D are coplanar if and only if AD. AB xAC=
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  • Navdeep 1 thankyou
    if A,B,C,D are co planer than angle between AB and AC is zero and ABxAC perpendicular to AD so AD.(ABxAC)=AD .{AB AC sin0}=0
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