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One more question:
A parallelogram has side lengths 12 and 15.
If the length of the longer diagonal is 20, what is the length of the shorter diagonal?
Easy to use online law of sines and law of cosines calculators and formulas from calculatorsoup.com
Free law of sines & law of cosines worksheets (with answers) from kutasoftware.com
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Mathplane introduction to vectors: notes, examples, and practice
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Math Comic #35 - "Study Break: Math Snacks (Trig Newtons)" - 6-3-12 (click lower right to view)