Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

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



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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