Question

When do we say two vectors are orthogonal

Answer 1

if the dot product of two vectors is equals to zero then two vectors are said to be orthogonal.

Answer 2

Answer:

if they are perpendicular to each other. i.e. the dot product of the two vectors is zero. Definition. We say that a set of vectors { v1, v2, ..., vn} are mutually or- thogonal if every pair of vectors is orthogonal.