Answer
$$z=43.2\space \text{cm}$$
Work Step by Step
For a circle of radius $r$, the arc length $s$ corresponding to a central angle $\theta$ (in radians) is given by $s=r\theta$.
Therefore,
$$z=(11 \text{cm})\bigg(\dfrac{5\pi}{4}\bigg) = \dfrac{55\pi}{4}\space \text{cm} = 43.2\space \text{cm}$$
