What has been the most difficult topic so far this year? Why? Do you understand it now?

I think that as far as this year has gone, the hardest topic that I have encountered in class, has been the things about the interior and exterior angles. I think I have problems with this topic, because I quite dont get the trick in where you can determine whether they are Alternate Interior Angles and Alternate Exterior Angles, because I really dont get the concept. I think I also have problems with them, because I can't picture the interior or exterior angles in my mind, and because of that it makes it be harder for me. I think that if I work on it, a little while longer, and practice it, I will be able to do it, with no problems. But I still need to work on that. Another thing that has come hard on me, are the two column proofs, I just can express what's going on in statements, Im more of a written proof because I can describe it and give the reasons in my own words without the statements, that are like steps.