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Geometry Problem 827: Brianchon Corollary, Circumscribed Hexagon, Tangency Points, Diagonal, Opposite Sides, Concurrent lines

The figure shows a circumscribed hexagon ABCDEF with the tangency points G, H, J, K, L, and M. Prove that AD, GK, and MJ are concurrent at N.


Brianchon Corollary in an circumscribed hexagon


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