Answer
The set $z=-2$ corresponds to the plane of equation $z=-2$.
Work Step by Step
In cylindrical coordinates, the $z$-coordinate is the same as in rectangular coordinates. Thus, the set $z=-2$ corresponds to the plane of equation $z=-2$.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.