The length of an arc is formulated by the formula: [tex]l = r\theta[/tex], provided [tex]\theta[/tex] is in radian form.
Thus, the length can be easily solved by substituting all that you need to know:
[tex]l = 15.2(\frac{3\pi}{4})[/tex]
[tex]l = \frac{45.6\pi}{4}[/tex]
