Alright, people, another issue here.
To make a modeling system using poly by poly technique, first, I create a plane: 2 vectors with a projection between them.
and then I have this issue: Two sides are vectors, but the other two are not. Is there any way I can convert those 2 sides to vectors so I can manipulate them?

heres a little diagram I drew in Paint (i didnt feel like starting up photoshop) to help you understand my problem.