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Problem 381. Quadrilateral, Diagonals, Angle Bisectors, Angles.
Level: High School, College, SAT Prep.

The figure shows a quadrilateral ABCD with AE angle bisector of angle BAC and DE angle bisector of angle BDC. Prove that angle AED = (angle ABD + angle ACD) / 2.

Quadrilateral, Angle Bisectors



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