## Precalculus (6th Edition)

$-5\pi$
RECALL: To convert an angle in degrees to radians, multiply $\dfrac{\pi}{180^o}$ then simplify. Thus, converting the given angle to radians gives: $\require{cancel} -900^o \\= -900^o \cdot \dfrac{\pi}{180^o} \\= -\cancel{900^o}^5 \cdot \dfrac{\pi}{\cancel{180^o}} \\=-5\pi$