Geometry Problems, Online Education

Problem 720: Excenter, Intersecting Circles, Angle, Measurement. High School, College

In the figure below, the circles O and O' intersect at A and B. C and O' are on circle O. CO' extended meets the circle O' at D. Prove that D is the excenter of the triangle ABC.
 

Excenter Intersecting circles, Angles, Measurement
 

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