In the parallelogram ABCD, e f is two points on the diagonal AC, and AE = CF

If there is parallelogram ABCD, ab = CD and parallel angle BAC = angle DCA, angle EAB = angle FCD are obtained
Because AE = CF
It is concluded that Abe is equal to CDF
The angle Bae is equal to the angle CDF
therefore
Angle ADF = angle CBE

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