Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 6 - Trigonometric Functions - 6.1 Angles and Their Measure - 6.1 Assess Your Understanding - Page 362: 45


$\frac{-\pi}{2}\text{ radians}$

Work Step by Step

Recall that $2\pi\text{ radians}=360^\circ$, hence $\frac{\pi\text{ radians}}{180}=1^\circ$. Therefore: $-90^{^\circ}=-90 \cdot\frac{\pi\text{ radians}}{180}=\frac{-\pi}{2}\text{ radians}$
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