

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.







