Calculus 3: Tangent vectors and arc length

Calculate the length of the vector valued function 3cos(2t), 3sin(2t), 2t over the interval for t from 0 to $2\pi$.

Find the arc length of the curve given that $\vec{r}(t) = 3\cos(t)\hat{i} + 3\sin(t)\hat{j} + 6t\hat{k}$ where $t$ is from 0 to $\pi$.