Digital ACT Math Practice Question #2019
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Law of Cosines: c^2 = 5^2 + 7^2 - 2(5)(7)*cos(60°) -> c = sqrt(39).
By the Law of Cosines: c^2 = a^2 + b^2 - 2ab*cos(C) = 25 + 49 - 2(5)(7)*cos(60°). Solving gives c = sqrt(39)....
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