A triangle PQR in 3D-space has vertices P(1,2,3), Q(5,4,2), R(0,5,5). Use vectors to decide which one of the following properties the triangle has. Explain, please. Possible answers:  1. right angled at R 2. not right angled at P, Q, or R 3. right angled at P 4. right angled at Q

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