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Below are a few FBDs of problems I'm working on just to give a better idea of what I'm talking about.

http://i53.tinypic.com/69fjvc.png

http://i51.tinypic.com/2lji5ol.png

http://i56.tinypic.com/2gv4fet.png

http://i52.tinypic.com/2rrw094.png

http://i56.tinypic.com/2e6a1qt.png

Can someone please walk me through how to calculate cross-sectional area for these kind of problems (what angle/trig functions to use, etc)