Arc AB= arc AF push-out angle AFB= angle ABF.
And because the angle is not good+angle ABF+ angle FBD = 90°, it is perpendicular to BC from AD.
Because arc AB+ arc AF+ arc fc = 90,
So angle Abe+angle AFB+ angle FBC=90 degrees.
So: angle BAD= angle AFB, so: angle BAE= angle ABE: AE=BE.
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