Question

If a and b are perpendicular what is their dot product

Answer 1

That is to say, the dot product of two vectors will be equal to the cosine of the angle between the vectors, timesthe lengths of each of the vectors. Angular Domain of Dot Product: ... If A and B are perpendicular (at 90 degrees to each other), the result of the dot product will be zero, because cos(Θ) will be zero.