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(Total 16 marks) 9. The vertices of the triangle PQR are defined by the position vectors 3. OQ and OR = OP (a) Find PO, PR (i
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(9) The vertices of a tri angle PQR are defined by the position vectors 9. -1,OR 4 OP %3D (a) (i) To find PQ PQ = 0Q-OP [3 -3

(b) To prove that cos RPQ) = PO PR= 2 = -2+4+4 = 6 PO = Vi+4+1 PR = J4+4+16 = 24 PO PR cos (RPO) = VON24 -TON2A cos (RPC) = (

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