ACBCAE的精选

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...