# Chapter 4 - Section 4.1 - Angles and Radian Measure - Exercise Set - Page 532: 7

#### Work Step by Step

The measure of the central angle θ = $\frac{length of the intercepted arc}{radius}.$ s = 40 inches, r = 10 inches. θ = $\frac{s}{r}$ = $\frac{40}{10}$ = 4 radians.

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