Answer
4.5
Work Step by Step
We know that the length of the arc is:
$$s=r\theta$$
Where theta is in radians. Thus, we find:
$$\theta =\frac{s}{r}=\frac{18}{4}=4.5$$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 6 - 6.1 - Angles and Their Measure - 6.1 Exercises - Page 432: 85
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