Answer
$\pi$ radians
Work Step by Step
As we know that
$1^{\circ}=\frac{\pi}{180}$
$\implies 180^{\circ}=180\times \frac{\pi}{180}$
$\implies 180^{\circ}=\pi$ radians
Precalculus (10th Edition)
by Sullivan, Michael
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 361: 7
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