Chapter 12 - Section 12.6 - Radian Measure - Exercise - Page 417: 5

$60^o$

To convert radians to degrees, multiply $\dfrac{180^o}{\pi \text{radians}}$ to the given radian measurement to obtain: \begin{align*} \dfrac{\pi}{3}\text{ rad} \cdot \dfrac{180^o}{\pi\text{ rad}}&=\dfrac{180^o}{3}\\\\ &=60^o\end{align*}