Find the angle $\theta$ between the pair of vectors u and v.
$u = \begin{bmatrix} 1\\ 1 \end{bmatrix}, v = \begin{bmatrix} 7\\ 11 \end{bmatrix}$
I already figured that I'll need the lengths of the vectors so I calculated those:
||u|| = $\sqrt{2}$, and ||v|| = $\sqrt{170}$
Now what do I do?