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MHT CET202012 Oct 2020Evening ShiftMathematicsVector AlgebraActual

If P (3,2,6), Q (1,4,5) and R (3,5,3) are the vertices of PQR , then m PQR is

Options

  1. A90^
  2. B50^
  3. C70^
  4. D30^

Correct answer

A. 90^

Step-by-step solution

We have P (3,2,6) ; Q (1,4,5) and R (3,5,3) d.r. of PQ are -2,2,-1 and d.r. of QR are 2,1,-2 We find that : (-2)(2)+2(1)+(-1)(-2)=-4+2+2=0 PQ QR m PQR =90^

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