∵AD=AF AD=10∴AF=10∵AB=8∴BC=√(10²-8²)=6∴CF=BC-BF=10-6=4∵ ∠AFB ∠BAF= ∠AFB ∠EFC∴ ∠BAF= ∠EFC∵ ∠ABF= ∠FCE=90°∴△ABF∽△FCE∴AB:CF=BC:EC 8:4=6:ECEC=3
