Because a = 60, we choose this area formula S=bcsinA/2=√3, that is, bc=4.
Cosine Theorem A 2 = B 2+C 2-2 BCCOSA is chosen because a=2.
Substitute BC = 4a = 60 into the above formula: 4 = B 2+C 2-4, that is, B 2+C 2 = 8.
Then substitute b=4/c into the above formula: c=2, so b=4/c=2.