Relative to a fixed origin OOO, the point A A\,A has position vector (−2i+3j+5k)(-2\mathbf{i} + 3\mathbf{j} + 5\mathbf{k})(−2i+3j+5k), the point B B\,B has position vector (−5i+10j+k)(-5\mathbf{i} + 10\mathbf{j} + \mathbf{k})(−5i+10j+k), and the point C C\,C has position vector (−3i+7j−4k)(-3\mathbf{i} + 7\mathbf{j} - 4\mathbf{k})(−3i+7j−4k).
Find BC⃗\vec{BC}BC
Show that the quadrilateral OABC OABC\,OABC is a parallelogram, giving reasons for your answer.
309 exam-style questions on Edexcel A Level Maths Vectors, covering 12.1 3D Coordinates, 12.2 Vectors in 3D, 12.3 Solving Geometric Problems, and 12.4 Application to Mechanics. Each one has a worked solution and a mark scheme showing where the marks go.