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Geometry Problem 949: Intersecting Circles, Secant, Cyclic Quadrilateral, Concyclic Points. Level: School, College, Mathematics Education

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The figure below shows circles O1 and O2 with the secants C1AC2, D1AD2, and E1AE2. D1C1 and C2D2 meet at F; E1D1 and D2E2 meet at G. Prove that the points B, D1, G, F, and D2 are concyclic.

 

Geometry Problem 949: Intersecting Circles, Secant, Cyclic Quadrilateral, Concyclic Points

 

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