If a polyhedron is

7ft at the bottom live
3ft bottom left corner
5ft middle
Where would I highlight the base or bases of it
It's a picture tho

The base of the polyhedron would be highlighted as follows:

- The bottom right corner would be 7ft from the bottom
- The bottom left corner would be 3ft from the bottom
- The middle point would be 5ft from the bottom

So, if you highlight a line connecting the bottom left corner to the bottom right corner (which are both at the same height), that line would represent the base of the polyhedron in the picture.