Geometric Two Column Proofs?

I've been working on Two Column Proofs in my Geometry class for the past week, and it hasn't been clicking for me. I'm usually pretty good at understanding concepts in class, but I've been having problems with this. I'm even having problems remembering properties. These are two proofs that I... show more I've been working on Two Column Proofs in my Geometry class for the past week, and it hasn't been clicking for me. I'm usually pretty good at understanding concepts in class, but I've been having problems with this. I'm even having problems remembering properties.

These are two proofs that I had to complete (my answers are shown on the image)
http://i281.photobucket.com/albums/kk236...
http://i281.photobucket.com/albums/kk236...

I only got one of the answers correct, and I'm so confused. I don't want someone to just hand me the answers; I'm looking for a helpful explanation. Any help would be appreciated! Thank you.
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