# Chapter 5 - Trigonometric Functions - Section 5.1 Angles and Their Measures - 5.1 Assess Your Understanding - Page 386: 36

$\dfrac{2\pi}{3}$

#### Work Step by Step

$\because 1 \text{ degree } = \dfrac{\pi}{180} \text{ radians}$ $\therefore 120^{\circ} = 120 \times \dfrac{\pi}{180} = \boxed{\dfrac{2\pi}{3}} \text { radians}$

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