Digital ACT Math Practice Question #2015
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
Law of Cosines: c^2 = 4^2 + 5^2 - 2(4)(5)*cos(60°) -> c = sqrt(21).
By the Law of Cosines: c^2 = a^2 + b^2 - 2ab*cos(C) = 16 + 25 - 2(4)(5)*cos(60°). Solving gives c = sqrt(21)....
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