Question

如图9所示,在△ABC与△DEF中,如果AB=DE,BC=EF,只要再找出∠_____=∠______或______=_____,就可证明这两个三角形全等.

Answer 1

∠ABC=∠DEF或AC=DF.

解:在△ABC和△DEF中,∵AB=DE,BC=EF,∴若∠ABC=∠DEF, 则△ABC≌△DEF,

△ABC和△DEF中,∵AB=DE,BC=EF,∴若AC=BF,则△ABC≌△DEF.

      点拨:此题是对两三角形全等识别法的考查,应加强两三角形全等识别法的理解与应用.