(1)若∠EAF=45度,求证EF=BE+FD
(2)若EF=BE+FD,求证∠EAF=45度
(1)若∠EAF=45度,求证EF=BE+FD
(2)若EF=BE+FD,求证∠EAF=45度
1.延长CB到G,使BG=FD
证△ABG≌△ADF
∴∠BAG=∠DAF
又△AEF≌△AEG
∴EF=EG=EB+BG=EB+DF
2.作AG⊥EF
∴BE=GE,DF=GF
AE=AE,AF=AF
∠ABE=∠AGF=∠ADF
∴△ABE≌△AGE
△AGF≌△ADF
∴∠BAE=∠GAE,∠GAF=∠DAF
∵∠BAD=90°
∴∠EAF=45°