# how to calculate the dot product ...

• March 23rd 2011, 11:22 PM
$\mathbf{a}\cdot\mathbf{b}=ab\cos(\theta),$
$a=|\mathbf{a}|,\;b=|\mathbf{b}|,\;\text{and}\;\the ta$ is the angle between the two vectors. The RHS should be fairly straight-forward in polar coordinates.