Arcs of a circle Geometry and angles If a central angle of measure $30°$ is subtended by a circular arc of length $6\,\mathrm{m}$, how many meters in length is the radius of the circle?
A. $\frac{π}{36}$
В. $\frac{1}{5}$
С. $π$
D. $\frac{36}{π}$
E. $180$


How do I find out what the radius length of the angle is? The answer is (D) by the way.

The way that you can solve this is by using the following formula: 
$$A=\frac{n}{360}\pi{r^2}$$
Hope that helps you out!  I can't figure out how to type in the equation!
