Question

Given 3 points in 3-space, intersected by two lines, only one point intersected by both lines, how do I calculate if the lines are perpendicular or not?

Answer 1

the line will be perpendicular (orthogonal) when their dot product equals zero

Answer 2

awesome, thank you so much!!

Answer 3

the point that is on the intersection of the lines will be a solution to the equations of both lines simultaneously