## Pascal's mystic hexagonIf a hexagon ADBFCE (not necessarily
convex) is inscribed in a conic section (in
particular a circle), then the points of intersections of opposite sides
(AD with FC, DB with CE and BF with EA) are collinear. This line is called the Pascal
line of the hexagon. A special case is when the conic degenerates
into two lines; the theorem still holds but is then usually called Pappus'
theorem. ## Related category• GEOMETRY | |||||

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