Find the Radian Measure of the Central Angle of a Circle

Find the radian measure of the central angle of a circle of radius r that intercepts an arc of length s.
- $r = \frac { 1 } { 3 }$ feet, $s = 8$ feet

A) 24 radians
B) $\frac { 8 } { 3 }$ radians
C) $24 ^ { \circ }$
D) $\frac { 8 ^ { \circ } } { 3 }$