We can define a plane with:
$$ax + by + cz + d = 0$$
However we assume all the variables above are $\in \mathbb{R}$.
Is there a formal name for a plane that is bounded by four line segments, or bounded to some finite area?
This may be analogous to when we differentiate a line from a segment, however I'm not sure if a term exists or if we would just call them a "square" or "rectangle" that happen to be in a 3D coordinate system.
Or is my definition wrong and a plane also includes a bounded area?