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The first volume of the eighth grade mathematics supplement
AB=AE

Angel Abe =AEB

Parallel BC

Angle AEB = EAD = 2 < BAE

ADCE is an isosceles trapezoid.

Angle EAD=CDA=2DAB

DAB=BAE

BF=AF

Angle BFE=FAB+FBA=2FAB=EAD=BEA.

BE=BF

So AF=BE

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