Trigonometry

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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^2-2bc(cos)(A)
- b^2=a^2+c^2-2accos(B)
- c^2=a^2+b^2-2abcos(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 Cosines--Solve

493
---- = cos(A)
532

A=cos-1(493/532)