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4 marksScalar (Dot) Product of Two Vectors

CSEC Additional Mathematics · May/June 2007 · Paper 2 · Question 9(i)

The position vectors, relative to an origin O, of three points P, Q and R are i + 3j, 5i + 11j and 9i + 9j respectively.

By finding the magnitude of the vectors PR, RQ and QP, show that angle PQR is 90°.

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Other parts of this question

  1. 9(ii)Find the unit vector parallel to PR.[2 marks]
  2. 9(iii)Given that OQ = mOP + nOR, where m and n are constants, find the value of m and of n.[3 marks]

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