Answer
$-120^{\circ}$
Work Step by Step
$ \because 1 \text { radian } = \dfrac{180}{\pi} \text { degrees}$
$\therefore \dfrac{-2 \pi}{3} \text{ rad } = \dfrac{-2 \pi}{3} \times \dfrac{180}{\pi} = \boxed{-120^{\circ}}$
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: 50
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