Točno
15. studenoga 2017. 02:31 (6 godine, 4 mjeseci)
Let ABCD be a cyclic quadrilateral whose diagonals AC and BD meet at E. The extensions of the sides AD and BC beyond A and B meet at F. Let G be the point such that ECGD is a parallelogram, and let H be the image of E under reflection in AD. Prove that D,H,F,G are concyclic.
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