Find the angle?

Question

Find the angle θ (from its cosine) between v=[2, 2, -1] and w=[2, -1, 2].

 

These are vectors with 2 on top, 2 on middle, -1 on bottom. And w with 2 on top, -1 on middle, 2 on bottom. I got the dot product, which is 0. And cos theta=0, so theta=90 degrees. Am I right? I just need to make sure that the answer is right.

Answer 1

You are right. The two vectors are perpendicular to each other.