Question

If A(x1, y1), B(x2, y2), C(x3, y3), and D(x4, y4) form two line segments, AB and CD , which of these conditions needs to be met to prove that AB is perpendicular to CD?

Answer 1

Find the slope of AB, let's say its m1

Find the slope of CD, let's say it's m2

For 2 lines to be perpendicular to each other they need to satisfy the condition:

m1 x m2 = -1

Answer 2

Oh,okay, thanks!