Angle calculation between vectors

The concept of vector angles is used to describe the angular difference of physical quantities with an amplitude and the direction associated with them. The vector angle is calculated from the endpoints of the endpoints of the first row to the second row. The endpoint is determined by the vector direction of the line in which it is measured

Vector angle formula

\(cos=a \times b/[|a| \times |b|] =(x1x2+y1y2)/[√[x1^2+y1^2] \times √[x2^2+y2^2]]\)

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