Geometry•hard

Triangle Side via Law of Cosines

In triangle $ABC$ , $AB = 5$ , $BC = 8$ , and angle $B = 60°$ . What is the length of $AC$ ?

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Geometry•hard

In triangle $ABC$ , $AB = 5$ , $BC = 8$ , and angle $B = 60°$ . What is the length of $AC$ ?