As shown in the figure, point D is a point on the AC side of equilateral △ ABC, ∠ 1 = ∠ 2, BD = CE

As shown in the figure, point D is a point on the AC side of equilateral △ ABC, ∠ 1 = ∠ 2, BD = CE

It is proved that the ∵ triangle ABC is an equilateral triangle ∵ AB = AC, in ∵ abd and ≌ ace, ab = AC ∵ 1 ∵ 2bd = CE ≌ abd ≌ ACE (SAS) ≌ AE = ad, ∵ bad = ≌ DAE = 60 °≌ ade is an equilateral triangle