Digital ACT Math Practice Question #2017
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Law of Cosines: c^2 = 3^2 + 5^2 - 2(3)(5)*cos(120°) -> c = 7.
By the Law of Cosines: c^2 = a^2 + b^2 - 2ab*cos(C) = 9 + 25 - 2(3)(5)*cos(120°). Solving gives c = 7....
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