Consider the given function, $r = 2 \sin \theta$.
The shaded region (shown above) lies in the $\theta$ interval $0 \le \theta \le \frac{\pi}{2}$.
Find the radius or r function value that corresponds to each of the theta endpoints:
• When $\theta = 0$, r = [Select]
• When $\theta = \frac{\pi}{2}$, r = [Select]