Question

Show that the line joining the points (2, 3, –4), (–3, 3, –2) is not perpendicular to the line joining the points (–1, 4, 2), (3, 5, 1).

Answer 1

Let A(2, 3, –4), B(–3, 3, –2), C(–1, 4, 2), D(3, 5, 1)