As shown in the figure, extend the edge BC of △ ABC to d so that CD = BC, take the midpoint F of AB and the edge DF intersect AC with E, and calculate the value of aeac

Through point C, cm ∥ AB, ∥ CD = BC, cm ∥ AB, ∥ cm ∥ 12bf, ∥ AB, F, ∥ AF = BF, ∥ cm ∥ 12af, ∥ AFE ∥ CME, ∥ cmaf = ECAE = 12, ∥ aeac = 23

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