Answer
$-\frac{5\pi}{3}radians$
Work Step by Step
In order to convert degree measures to radians, we must multiply the given degree measure by $\frac{\pi}{180}$ and simplify.
$-300^{\circ}=-300\times(\frac{\pi}{180}radians)=\frac{-300\pi}{180}radians=-\frac{5\pi}{3}radians$
