Online Geometry Problems

Online Geometry Problem 631: Triangle, Exterior Angle Bisectors, Collinear Points. Level: High School, Honors Geometry, College, Mathematics Education

The figure shows a scalene triangle ABC with the exterior angle bisectors AA', BB' and CC'. Prove that C', A', and B' are collinear.
 
 

Triangle, Exterior Angle Bisectors, Collinear Points
 

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