AC=BC,CD=CE
∠ACB=∠ACd=90°
△CBE≌△ACD
∠DAC=∠CBE
∠DAC+∠D=90°
∠CbE +∠D =90°
BF⊥AD
BE是角平分线
AF=FD
△AFE∽△ACD
AF:AC=AE:AD=AE:2AF
AE*AC=2AF^2
AC=BC,CD=CE
∠ACB=∠ACd=90°
△CBE≌△ACD
∠DAC=∠CBE
∠DAC+∠D=90°
∠CbE +∠D =90°
BF⊥AD
BE是角平分线
AF=FD
△AFE∽△ACD
AF:AC=AE:AD=AE:2AF
AE*AC=2AF^2