this is the answer to one of my questions. This is an on-line class. I don't know how they got the answer. I sent an email to the teacher but no response yet.
121pi/6 - 121 sqrt3/4 = 11.0 m squared
I figured it out....
63.3 - 52.3 = 11.0 msquared
121pi/6 - 121 sqrt3/4 = 11.0 m squared
63.3 - 52.3 = 11.0 msquared