Digital ACT Math Practice Question #2018
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
Law of Cosines: c^2 = 7^2 + 8^2 - 2(7)(8)*cos(120°) -> c = 13.
By the Law of Cosines: c^2 = a^2 + b^2 - 2ab*cos(C) = 49 + 64 - 2(7)(8)*cos(120°). Solving gives c = 13....
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