Sunday, June 23, 2019

geometry - The circumcircles of the triangles OAD, OBE & OCF has another common point beside O!

Given a convex hexagon ABCDEF circumscribing a circle (O). Assume that O is the circumcenter of the triangle ACE.



I see that the circumcircles of the triangles OAD, OBE & OCF has another common point beside O. But I can't know this point is, and how to prove the problem I see. Please help my 1st post! Thanks!

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