Chapter 6 - The Circular Functions and Their Graphs - Chapter 6 Test Prep - Review Exercises - Page 644: 11

$${225^ \circ }$$

$$\eqalign{ & \frac{{5\pi }}{4} \cr & {\text{Multiply by }}\frac{{{{180}^ \circ }}}{\pi }. \cr & \frac{{5\pi }}{4}{\text{radians}} = \frac{{5\pi }}{4}\left( {\frac{{{{180}^ \circ }}}{\pi }} \right) \cr & {\text{Simplify}} \cr & \frac{{5\pi }}{4}{\text{radians}} = \frac{{{{900}^ \circ }}}{4} \cr & \frac{{5\pi }}{4}{\text{radians}} = {225^ \circ } \cr} $$