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: 56

Answer

$-180^{\circ}$

Work Step by Step

$ \because 1 \text { radian } = \dfrac{180}{\pi} \text { degrees}$ $\therefore - \pi \text{ rad } = - \pi \times \dfrac{180}{\pi} = \boxed{-180^{\circ}}$
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