The sum of the interior angles of any triangle is always 180º:

Use the equation above and the given data to find C:

Law of sines:

Use the pair of ratios for a and b to solve a:

Use the pair of ratios for b and c to solve c:

Thenm, the solution for the given triangle is:A=38ºB=72ºC=70ºa=7.8b=12c=11.9