Use the Arc Length Formula and the Given Information to Find

Multiple Choice

Use the arc length formula and the given information to find the indicated quantity.
- $\mathrm { s } = 15 \mathrm {~cm} , \theta = 45 ^ { \circ }$ ; find $\mathrm { r }$

A) $\frac { 1 } { 3 } \mathrm {~cm}$
B) $\frac { 30 } { \pi } \mathrm { cm }$
C) $\frac { 120 } { \pi } \mathrm { cm }$
D) $\frac { 60 } { \pi } \mathrm { cm }$