Chapter 6 - The Circular Functions and Their Graphs - Chapter 6 Test Prep - Review Exercises - Page 644: 16

$$ - {756^ \circ }$$

$$\eqalign{ & - \frac{{21\pi }}{5} \cr & {\text{Multiply by }}\frac{{{{180}^ \circ }}}{\pi }. \cr & - \frac{{21\pi }}{5}{\text{radians}} = - \frac{{21\pi }}{5}\left( {\frac{{{{180}^ \circ }}}{\pi }} \right) \cr & {\text{Simplify}} \cr & - \frac{{21\pi }}{5}{\text{radians}} = - \frac{{{{3780}^ \circ }}}{5} \cr & - \frac{{21\pi }}{5}{\text{radians}} = - {756^ \circ } \cr} $$