∵AB=BC,∠EAC=30°.∠ABC=90°
∴∠CAB=45°.∠EAB=15°
AB=BE BE=BF ∠ABC=∠EBF
△ABE≌△CBF ∠EAB=∠BCF=15°
∵∠FBC=90° ∠BCF=15°
∴∠CFB+∠BCF=90° ,
,∠EFB=45°∠EFC=30°
∵AB=BC,∠EAC=30°.∠ABC=90°
∴∠CAB=45°.∠EAB=15°
AB=BE BE=BF ∠ABC=∠EBF
△ABE≌△CBF ∠EAB=∠BCF=15°
∵∠FBC=90° ∠BCF=15°
∴∠CFB+∠BCF=90° ,
,∠EFB=45°∠EFC=30°