1.

Show that the points A(1, 2, 3), B(-1, -2, -1), C(2, 3, 2) and D (4, 7, 6) are the vertices of a parallelogram ABCD, but not a rectangle.

Answer»

Show that the points A(1, 2, 3), B(-1, -2, -1), C(2, 3, 2) and D (4, 7, 6) are the vertices of a parallelogram ABCD, but not a rectangle.



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