Answer
$r \geq 0,~~~$ $\frac{\pi}{4} \leq \theta \leq \frac{3\pi}{4}$
The region includes all the points that are located between the angles $\frac{\pi}{4}$ and $\frac{3\pi}{4}$.
Work Step by Step
$r \geq 0,~~~$ $\frac{\pi}{4} \leq \theta \leq \frac{3\pi}{4}$
The region includes all the points that are located between the angles $\frac{\pi}{4}$ and $\frac{3\pi}{4}$. Note that the points can be any distance from the origin since $r \geq 0$.
