Triangle Formulas
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law of cosines
a^2 = b^2 + c^2 - 2bc(cosA)
cos =?
adj/hyp
cot =?
adj/opp
herons formula
area = √s(s-a)(s-b)(s-c) s = 1/2(a+b+c)
sec =?
hyp/adj
csc =?
hyp/opp
tan =?
opp/adj
sin =?
opp/hyp
law of sines
sinA/a = sinB/b = sinC/c
45-45-90 triangle
√2-√2-2
cos45
√2/2
sin45
√2/2
cos30
√3/2
sin60
√3/2
30-60-90
1-√3-2
cos60
1/2
sin 30
1/2
area formula
1/2abSinC 1/2cbSinA 1/2acSinb
