关于ACBCAE的百科

• 如图,△ABC中,∠ACB=90°,AC=BC,AE⊥CD于点E,BD⊥CD于点D,AE=5cm,BD=2cm...

• 问题详情：如图,△ABC中,∠ACB=90°,AC=BC,AE⊥CD于点E,BD⊥CD于点D,AE=5cm,BD=2cm,求DE的长.【回答】解:∵∠ACB=90°,∴∠ACE+∠DCB=90°.∵AE⊥CD,∴∠ACE+∠CAE=90°,∴∠CAE=∠DCB.∵BD⊥CD,∴∠D=90°.在△AEC和△CDB中,∴△AEC≌△CDB(AAS),∴AE=CD=5cm,CE=BD=2cm,...
• 2020-02-0410109