In △ ABC, B = 60 ° and B2 = AC, then the shape of △ ABC is_______ .

In △ ABC, B = 60 ° and B2 = AC, then the shape of △ ABC is_______ .

According to the cosine theorem, we get that B2 = A2 + c2-2accosb = A2 + C2 AC, B2 = AC, ∧ A2 + C2 AC = AC, ∧ A-C) 2 = 0, ∧ a = C, ∧ a = b = C = 60 ° and the shape of ∧ ABC is equilateral triangle