Kenneth S. answered • 04/15/18
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"Opposite (C-A)" is not the usual notation. Refer to sides as AB, AC and BC. Now tell us which one = 12.
In any event, the solution to this problem will be achieved by simple use of the Law of Sines.
Kenneth S.
If AC = 12 (do NOT call it A-C), then that is the side opposite angle B.
You know all three angles (since two are given) and therefore you should proceed directly to use Law of Sines.
sin B / AC = sin A / BC where A = 84 degrees and this enables you to find BC.
Thereafter, it's easy to find AB by another use of Law of Sines.
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04/15/18
Anna L.
04/15/18