Question

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 it is not a rectangle.
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Answer 1

Answer:

This is your Correct Answer...

Answer 2

Answer:

first find the distance of vertices and than find the distance of diagonal

if ac bat esquals to bd then these r the vertices of a parallelogram