Law of Sines

Move the vertices to set up your problem, then step through the solution process.
Try to discover the formula and determine if it would work in solving for C or c, too.

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Notice that the Law of Sines works for known Angle-Angle-Side.
Of course, if you have an Angle-Side-Angle problem, you can use the Triangle Angle Sum Theorem to quickly find the third angle and convert the problem to AAS.

In short, the Law of Sines requires knowledge of 2 angles and a side opposite one of them.

Mark Fowler, Grafton HS, Created with GeoGebra