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Law of Sines:

      In any triangle Δ ABC, we have:
       \frac{a}{sinA} = \frac{b}{sinB} = \frac{c}{SinC}      

To differentiate Law of Sines from Law of Cosines, the Law of Sines can be used to solve a triangle in the following cases:
1.  The two angles and the included side are given (ASA or Angle-Side-Angle).
2.  The two angles and the side opposite one angle  are given (AAS or Angle-Angle-Side).

Please click image below to view an example, one of the problems I solved from the textbook Our World of Math, K-9).  

Stick to the pattern/rule/ steps, and you can solve similar problem on your own. Happy solving :-)