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

Answer

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

Work Step by Step

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

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.