If S Denotes the Length of the Arc of a Circle

Multiple Choice

If s denotes the length of the arc of a circle of radius r subtended by a central angle θ, find the missing quantity.
- $$\mathrm { r } = \frac { 1 } { 3 } \text { feet, } \mathrm { s } = 5 \text { feet, } \theta = \text { ? }$$

A) $\frac { 5 } { 3 }$ 。
B) 15 radians
C) $15 ^ { \circ }$
D) $\frac { 5 } { 3 }$ radians