Answer
$radius$
Work Step by Step
Recall that an angle in radian is defined as $\theta=\frac{s}{r}$ where $s$ is the arc length and $r$ is the radius of the circle. For $\theta=1\ rad$, we have $s=r$, thus the answer is $radius$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 6 - The Circular Functions and Their Graphs - 6.1 Radian Measures - 6.1 Exercises - Page 572: 1
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