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Law of Sines
a/sin(A)=b/sin(B)=c/sin(C)

When do you use law of cosines?
Only for SSS or SAS

Law of Cosines
 a^2=b^2+c^22bc(cos)(A)
 b^2=a^2+c^22accos(B)
 c^2=a^2+b^22abcos(C)

27.4 b
 x 
Sin (28.7) Sin (49)
Set up
 27.4
  x Sin 49
 Sin 28.6

Set up
22 12
 x 
Sin 42 Sin(B)
 Sin 1(12 Sin42)
 
 22

Law of CosinesSolve
493
 = cos(A)
532
A=cos1(493/532)

