Find the measure of angle Aif a = 34, b = 28 and c = 15.

Find the measure of angle Aif a = 34, b = 28 and c = 15.

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law of cosines, probably.

c^2 = a^2 + b^2 - 2abCos(C)

If you have trouble remembering this, notice how similar it looks to the Pythagorean theorem.

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