## Precalculus (10th Edition)

$13.96\text{ in}$
Here, $r$ denotes the radius of the sector of the circle. The Arc Length $s$ can be computed using the formula $s=r\cdot \frac{\theta}{180}\cdot \pi$ where $\theta$ is in degrees. Use the formula above to obtain $s=40\cdot \frac{20}{180}\cdot \pi\approx13.96\text{ in}$.