⑴∵∠1+∠aeb=180∠2+∠aec=180又∠1=∠2∴∠aeb=∠aec∵be=ce ∠aeb=∠aec ae=ae∴△abe≌△aec
∵∠1=∠2∴∠AEB=∠AEC∵BE=CE AE=AE ∴△ABE≌△ACE
