Hello, Sorry for the extended inactivity. I was unable to get 20pi as an answer, and eventually gave up. This was a bonus problem, so I wasn't that worried about it, as I figured it would be a better idea to study for my upcoming final than spend too much time on this problem. Then the class was over and I started worrying about other classes, and eventually completely forgot about this thread. Anyway, I'm still unable to get 20pi as an answer, but I did understand alexwang32's explanation, and I thought that seemed right. Anyway, thanks for the help on this problem everyone.
On a side note, I thought it was worth mentioning that I think Daedalus, judging from his picture, looks a lot like Ryan Haywood from Roosterteeth. http://images3.wikia.nocookie.net/__cb20121229060260/roosterteeth/images/1/1b/Ryan50ba8afb9fedf.jpg