To solve the exercise you can use the rule of three, like this
[tex]\begin{gathered} 180\text{ degrees}\rightarrow\pi\text{ radians} \\ x\text{ degrees}\rightarrow\frac{11\pi}{5} \end{gathered}[/tex][tex]\begin{gathered} x=\frac{\frac{11\pi}{5}radians\cdot180}{\pi\text{ radians}} \\ x=\frac{\frac{1980\pi}{5}radians}{\pi\text{ radians}} \\ x=\frac{396\pi\text{ radians}}{\pi\text{ radians}} \\ x=396\text{ degrees} \end{gathered}[/tex]Therefore,
[tex]\frac{11\pi}{5}\text{ radians }=396\text{ degrees}[/tex]