All points on or within the cylinder centered on the y-axis with radius 3.
Work Step by Step
Start with our cylinder, $x^2 + z^2 \leq r^2$ Radius: $r= 3$ We have found the radius, but have not accounted for the bounds set by the inequality. We want to account for all points $r \leq 3$. This tells us we are working with all points on or within our cylinder.