Answer
$\frac{11\pi}{7}$
Work Step by Step
$\frac{-31\pi}{7}$
add three multiples of $2\pi$ in $\frac{-31\pi}{7}$ to find the positive coterminal angle less than 2$\pi$.
$\frac{-31\pi}{7}$ + ($2\pi$ * 3)= $\frac{11\pi}{7}$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.1 - Angles and Radian Measure - Exercise Set - Page 533: 69
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