Field and Wave Electromagnetics 2nd Edition by David Cheng

Exercise 44

The three corners of a triangle are at P 1 (0, 1, -2), P 2 (4, 1, -3), and P 3 (6, 2, 5).
a) Determine whether P 1 P 2 P 3 is a right triangle.
b) Find the area of the triangle.