As shown in the figure, BD and CE are the heights of △ ABC, and BD = CE
It is proved that: in RT △ BCE and RT △ CBD, ∵ BC = bcce = BD, ≌ RT △ BCE ≌ RT △ CBD (HL), ≌ ABC = ACB, ≌ ABC are isosceles triangles
It is proved that: in RT △ BCE and RT △ CBD, ∵ BC = bcce = BD, ≌ RT △ BCE ≌ RT △ CBD (HL), ≌ ABC = ACB, ≌ ABC are isosceles triangles