If a Denotes the Area of the Sector of a Circle

Multiple Choice

If A denotes the area of the sector of a circle of radius r formed by the central angle θ, find the missing quantity. If
necessary, round the answer to two decimal places.
- $$\theta = \frac { \pi } { 4 } \text { radians, } \mathrm { A } = 50 \text { square meters, } \mathrm { r } = \text { ? }$$

A) 11.29 m
B) 4.43 m
C) 19.63 m
D) 78.5 m