Brianchon's theorem
The 3 long diagonals of a hexagon tangent to a conic section meet in a single point / From Wikipedia, the free encyclopedia
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In geometry, Brianchon's theorem is a theorem stating that when a hexagon is circumscribed around a conic section, its principal diagonals (those connecting opposite vertices) meet in a single point. It is named after Charles Julien Brianchon (1783–1864).