Given the measure in degrees:
[tex]-500\text{\degree}[/tex]
You can use the formula for converting a measure in degrees to radians:
[tex]Radians=Measure\text{ }in\text{ }degrees\cdot\frac{\pi}{180°}[/tex]
Therefore, by substituting the measure given in the exercise into the formula and then evaluating, you get:
[tex]Radians=-\frac{25\pi}{9}[/tex]
Hence, the answer is:
[tex]-\frac{25\pi}{9}[/tex]
