## Algebra and Trigonometry 10th Edition

Published by Cengage Learning

# Chapter 6 - 6.1 - Angles and Their Measure - 6.1 Exercises - Page 432: 85

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: $$\theta =\frac{s}{r}=\frac{18}{4}=4.5$$

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