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12th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-4

  • question_answer
    For any four points P, Q, R and \[S;\text{  }\!\!|\!\!\text{ }\overrightarrow{PQ}\times \overrightarrow{RS}-\] \[\overrightarrow{QR}\times \overrightarrow{PS}+\overrightarrow{RP}\times \overrightarrow{QS}|\]is equal to 4 times the area of the triangle ___.

    A)  PQR                

    B)  QSR        

    C)  PRS                

    D)  PQS

    Correct Answer: B

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