Chapter 6 - The Circular Functions and Their Graphs - Chapter 6 Test Prep - Review Exercises - Page 644: 13

$${480^ \circ }$$

$$\eqalign{ & \frac{{8\pi }}{3} \cr & {\text{Multiply by }}\frac{{{{180}^ \circ }}}{\pi }. \cr & \frac{{8\pi }}{3}{\text{radians}} = \frac{{8\pi }}{3}\left( {\frac{{{{180}^ \circ }}}{\pi }} \right) \cr & {\text{Simplify}} \cr & \frac{{8\pi }}{3}{\text{radians}} = \frac{{{{1440}^ \circ }}}{3} \cr & \frac{{8\pi }}{3}{\text{radians}} = {480^ \circ } \cr} $$