如图,在△ABC中,AB=AC,分别以AB,AC为边作两个等腰直角三角形ABD和ACE,使∠BAD=∠CAE=90°. 求证:BD=CE.

问题描述:

如图,在△ABC中,AB=AC,分别以AB,AC为边作两个等腰直角三角形ABD和ACE,使∠BAD=∠CAE=90°.
求证:BD=CE.

证明:∵△ABD和△ACE是等腰直角三角形,
∴AB=AD,AC=AE,
∵AB=AC,
∴AD=AE,
在△ADB和△ACE中,

AB=AC
∠BAD=∠CAE=90°
AD=AE

∴△ADB≌△ACE,
∴BD=CE.