Creating an edge to complete a polygon

[pabonyeray]

Hi guys! I'm pretty new at modeling in MAYA. I'm wondering how can I create an edge to complete a polygon, as shown in the pictures below. I would highly appreciate solutions! 🙂 Thanks in advance! 

^ Last picture is from inside. 

[damaggio]

You are building a very messy model there, most tools won't work this way, your model has to be made of quads, ( and a few triangle if necessary )that's a polygon face that has 4 vertices, your faces have 5 and more vertices, tools like the split polygon tool and edge loop will not function, read a little bit more about modeling clean topology....you might waste a lot of time on something that is not gonna be useful by the time you think its done.

[pabonyeray]

Thank you very much for pointing that out! I read about it now and I believe I have to make some changes to my model. 🙂 Thanks again.