As shown in the figure: in △ EBD, EB = ed, point C is on BD, CE = CD, be ⊥ CE, a is a point on the CE extension line, EA = EC. Try to judge the shape of △ ABC and prove your conclusion

As shown in the figure: in △ EBD, EB = ed, point C is on BD, CE = CD, be ⊥ CE, a is a point on the CE extension line, EA = EC. Try to judge the shape of △ ABC and prove your conclusion

Δ ABC is an equilateral triangle. ∵ CE = CD, ∵ d = ∵ Dec, ∵ ECB = ∵ D + ∵ Dec = 2 ∵ D. ∵ be = De, ∵ EBC = ∵ D. ∵ ECB = 2 ∵ EBC. Also ? be ⊥ CE, ? ECB = 60 °. ? be ⊥ CE, AE = CE, ? AB = BC