Online Geometry Problems

Online Geometry Problem 627: Cyclic Quadrilateral, Congruence, Concyclic Points. Level: High School, Honors Geometry, College, Mathematics Education

The figure shows a cyclic quadrilateral ABCD. If BE = AB and CF = CD, prove that points A, E, F, and D are concyclic (lie on a same circle).
 

Cyclic quadrilateral, concyclic points

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