Consider the conversion,
[tex]1\text{ rad}=\frac{180}{\pi}\text{ deg}[/tex]Then the equivalent degree measure of 5 radians is calculated as,
[tex]\begin{gathered} \frac{5\pi}{3}\text{ rad} \\ =\frac{5\pi}{3}\times1\text{ rad} \\ =\frac{5\pi}{3}\times\frac{180}{\pi}\text{ deg} \\ =300\text{ deg} \end{gathered}[/tex]Thus, the given angle measure is equivalent to 300 degrees.