#### Question

By vector method show that the quadrilateral with vertices A (1, 2, –1), B (8, –3, –4), C (5, –4, 1), D (–2, 1, 4) is a parallelogram.

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Solution for question: By vector method show that the quadrilateral with vertices A (1, 2, –1), B (8, –3, –4), C (5, –4, 1), D (–2, 1, 4) is a parallelogram. concept: Vectors - Diagonals of a Parallelogram Bisect Each Other and Converse. For the courses HSC Arts, HSC Science (Computer Science), HSC Science (Electronics), HSC Science (General)