How do I solve this equation

To make getting to BWI easier, we are going to use a shuttle service. We will get on the Baltimore Beltway (1-695) at exit 36, Philadelphia Road (MD 7) and take it over the Key Bridge to exit 7, the Baltimore Washington Parkway (MD 295). Assuming the Beltway was a perfect circle with a radius of 8.21 miles, and the angle between exits 7 and exit 36 is 2.54 radians, find the distance traveled (in other words the length of the arc). Round to one decimal place