Answer
$\dfrac{2\pi}{3}$
Work Step by Step
$\because 1 \text{ degree } = \dfrac{\pi}{180} \text{ radians}$
$\therefore 120^{\circ} = 120 \times \dfrac{\pi}{180} = \boxed{\dfrac{2\pi}{3}} \text { radians}$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
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
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