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Answers by Mujahid D.

use the law of cosines.  its pretty straight forward.  Usually when you learn the law of cosines you learn that c^2 = a^2 + b^2 - 2ab cos C.  You use this form if you have angle C.  If you have angle A, which is what your question is asking, you use: a^2 = b^2 +...