For vectors A = Xa, Ya and B = Xb, Yb, the dot product A•B = (xa)(xb ) + (ya) (yb).
The inner product of two vectors.
A form of vector multiplication, where two vectors are multiplied to produce a scalar. The dot product of two vectors, and , is expressed by the equation · = AB cos .
In mathematics, the dot product, also known as the scalar product, is a binary operation which takes two vectors over the real numbers R and returns a real-valued scalar quantity. It is the standard inner product of the Euclidean space.