Problem 724: Circumscribed or Tangential Quadrilateral, Circle, Angle, Measure. High School, College

In a tangential quadrilateral ABCD with incenter O, points E and F lie on segments OA and OC. If angle EBF is half of angle ABC, prove that angle EDF is half of angle ADC. See the diagram.

Tangencial, Circumscribed Quadrilateral, Angles

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Prove the Half-Angle Relationship in a Tangential Quadrilateral of problem 724 using iPad App

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Problem 724: Circumscribed or Tangential Quadrilateral, Circle, Angle, Measure. High School, College

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