Ac = ad, angle CAB= angle DAB,AB=AB∴△CAB≌△DAB.
Angle CBE= Angle DBE, CB=DB
Become again
∴△CEB≌△DEB
The second way: (in two right-angled triangles, one of the right-angled sides and the hypotenuse are equal, then the two triangles are equal)
∫ Angle B= Angle D=90? ,AB=AD,AC=AC
∴△ABC≌△ACD, ∴ angle ACB= angle ACD, that is, the certificate is obtained.
The third way: (in two right-angled triangles, one of the right-angled sides and the hypotenuse are equal, then the two triangles are equal)
∫ Angle ADB= Angle BCD=90? ,AD=BD,AB=BA
∴△ABD≌△BAC ∴AD=BC