Dot product is proportional to cosine of angle between vectors (vector)

The dot product of two vectors is a scalar binary operation that can be defined as the product of the norms of the vectors and the cosine of the angle between them. Also see the scalar law.

Links:

  1. Wikipedia.

first_vector

First vector.

Symbol:

u

Latex:

\({\vec u}\)

Dimension:

any_dimension

second_vector

Second vector.

Symbol:

v

Latex:

\({\vec v}\)

Dimension:

any_dimension

angle_between_vectors

angle between first_vector and second_vector.

Symbol:

phi

Latex:

\(\varphi\)

Dimension:

angle

law

dot(u, v) = norm(u) * norm(v) * cos(phi)

Latex:
\[\left( {\vec u}, {\vec v} \right) = \left \Vert {\vec u} \right \Vert \left \Vert {\vec v} \right \Vert \cos{\left(\varphi \right)}\]