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Problem 358. Isosceles triangle 80-80-20, Circle, Angles, Congruence.
Level: High School, College, SAT Prep.

In the figure below, triangle ABC is isosceles with AB = BC and angle B = 20. The cevian AD is equal to BD and the circle of center C and radius equal to CA cut AB and BC at points E and F, respectively.
Prove that AE = DF. Try to use elementary geometry (Euclid's Elements.)

Isosceles triangle 80-80-20 

 

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