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Online Geometry Problem 741: Scalene Triangle, Incenter, Circumcircle, Midpoint, Arc, Congruence. Level: High School, Honors Geometry, College, Mathematics Education

The figure shows a triangle ABC with the incenter I and the circumcircle O. If D is the midpoint of arc AC, prove that AD, DI, and DC are congruent.
 

Triangle, Incenter, Circumcircle, Midpoint, Arc, Congruence
 

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