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        		Problem 368. Triangle, 120 degrees, Angle bisectors, 
				Perpendicular, Infographics.
				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. 
                
  
				 
                
  
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