Answer
$8\pi$ rad.
Work Step by Step
Since $2\pi$ corresponds to one rotation around the unit circle, $4$ rotations equate to $4(2\pi)=8\pi$ rad.
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 7 - Trigonometry and Periodic Functions - Review Exercises and Problems for Chapter Seven - Page 316: 32
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