By geometrical definition, dot productof two vectors is equal to the product of the magnitude of two vectors and cosine of angle between them. If A and B are two vectors, then
A.B = |A||B| cos θ
Where θ is the angle between vectors A and B.
If θ = 90, then the vectors A and B are orthogonal, as cos 90 = 0.
If θ = 0, then the vectors A and B are parallel, as cos 0 = 1.
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