I cant figure out the answers to these questions:

If this triangle has an area of 24cm^2, what is the value of angle D? http://i431.photobucket.com/albums/q...signmentq8.jpg

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Find the largest angle of this triangle:

http://i431.photobucket.com/albums/q...ignmentq10.jpg

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Please show working in a simple way, I'm not too good at this and I really want to understand trigonometry.