Question

Three vertices of a Parallelogram ABCD are A (1, 2, 3), B (– 1, – 2, – 1) and C (2, 3, 2). Find the fourth vertex D.

Answer 1

Given; Three consecutive vertices of a parallelogram ABCD are A (1, 2, 3), B (– 1, – 2, – 1) and C (2, 3, 2)

Let the forth vertex be D(x,y,z).

⇒ z=6

∴ D(4, 7, 6) is the forth vertex.