Incorrect. Use the formula $\displaystyle{s}={r}\theta\usepackage{cmbright}\Huge\$ for arc length. In this circle, $\displaystyle{r}={10}\usepackage{cmbright}\Huge\$ cm, and $\displaystyle\theta={2.5}\usepackage{cmbright}\Huge\$ . The correct answer is 25 cm.