precalc law of sines and cosines
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law of cosines
a^2 = b^2 + c^2 - 2bc(cosA)
2
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law of sines
a/sinA = b/sinB
3
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area of a triangle
k= 1/2ab(sinC)
4
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area of a parallelogram/rhombus
k = ab(sinC)
Note 
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