So I'm not sure how to solves these problems. The Question asks to Determine whether the given vectors are orthogonal, parallel or neither.
1) a = <-5, 3, 7> and b = <6, -8, 2>
2) a = <4, 6> and b = <-3, 2>
So I understand that I have to find the angle between the two vectors. And that will determine what is it. So for the first one, I got an angle of 115.5 Degrees. But now how do I know where that falls into?
I'm also assuming that orthogonal is perpendicular? Which means that the angle is 90 degrees or pi/2 radians.