Answer
If $\mathbf{v}$ and $\mathbf{w}$ are two non-zero vectors and $\theta $ is the smallest non-negative angle between them, then $\mathbf{v}\cdot \mathbf{w}=\underline{\left| \mathbf{v} \right|\left| \mathbf{w} \right|\cos \theta }$.
Work Step by Step
Dot product of two vectors is given as
$\mathbf{v}\cdot \mathbf{w}=\left| \mathbf{v} \right|\left| \mathbf{w} \right|\cos \theta $
where $\theta $ is the angle between the vectors $\mathbf{v}$ and $\mathbf{w}$.
