Am moving on to this<>http://www.youtube.com/watch?v=YFXKu16kWd0
Ukmc lectures on Trig. Very nicely explained.
Can also view the side bar at youtube or search to help problem solve this. (or google calculators with explanations. Try at mathsisfun.)
http://www.mathsisfun.com/area.html < here is the basic equation.
http://www.mathsisfun.com/algebra/trig-area-triangle-without-right-angle.html < here is trig equations. Coupled with the youtube video should be enough.