Respuesta :
[tex]\bf \textit{arc's length}\\\\
s=\cfrac{\theta \pi r}{180}\quad
\begin{cases}
r=radius\\
\theta =angle\ in\\
\qquad degrees\\
-------\\
r=16\\
\theta =68
\end{cases}\implies s=\cfrac{68\cdot \pi \cdot 16}{180}\implies \cfrac{272\pi }{45}[/tex]