[SOLVED] Geometry Proofs. Hello, I am currently taking a second year mathematics course in geometry at university. I have to do quite a few proofs and I am not used to doing proofs much less geometry proofs -last time I took geometry was when I was in grade 10 and that was over ten years ago. So far in the course we have covered various theorems and have done proofs for these theorems. What I would like to know is, when I am attempting to prove or disprove a propostion/claim, if I state a point in my proof, can I say "by theorem"? Or once I have made a point, do I have to do a subproof and prove the theorem with respect to that point? I hope my question is clear. Any input would be appreciated.