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