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.
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