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Problem 368. Triangle, 120 degrees, Angle bisectors, Perpendicular.
Level: High School, College, SAT Prep.

The figure shows a triangle ABC with angle bisectors AD, BE, and CF. If the measure of the angle BAC is 120 degrees, prove that ED and FD are perpendicular.
 

Triangle 120 degrees, angle bisectors, perpendicular 


 

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