How do you check if 2 vectors are orthogonal? I know that if 2 vectors are orthogonal, then there dot product is 0. But I don't think that necessarily means if their dot product is 0, the 2 vectors are orthogonal. Like what if you had 2 zero vectors, their dot produt would be 0, but they're not orthogonal. I also know that the angle between the 2 vectors is 90 degrees. I think this one that 2 vectors that are 90 degrees apart are orthogonal. Right?