31. Take a ruler and line it up to one side. Use your pencil and draw a line up the ruler leaving a mark on the paper lining up to one side. Do the same with the other side. If it looks like they wouldn't ever cross each other than they are parallel.
32. In this question I can't tell what those signs are in between AMN and CP. Also, MN and 1/2 BC. Please tell me what they are so I could finish your question if I can. ;)
Hoped I helped!