AB2 = AD2 + BD2 - 2AD * BD * cos120AB2 = 49 + 9 - 42 * (-1/2) = 79AB = √79
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AB2 = AD2 + BD2 - 2AD * BD * cos120
AB2 = 49 + 9 - 42 * (-1/2) = 79
AB = √79