Parabolas can be the only conic sections that are considered functions because they pass the vertical line test. We have worked with parabolas before in quadratic equations, but parabolas formed by conic sections are a little different.
Toilet drainage rough-in steps. 1  Cut a hole in the subfloor just large enough for the bottom part of the toilet flange to sit. 2  If your installing the drainage underground, excavate the trench and have a supply of clean backfill ready (sand or gravel) to grade and cover the pipe.
How to Plumb a Toilet From Start to Pipe. 1  Determine the location of the hole for the new toilet by measuring from the walls with a tape measure. 2  Cut out the hole with a reciprocating saw. 3  Install a toilet flange by pushing the pipe through the floor and setting the metal or plastic ring on the subfloor.