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Pascal's theorem
[b]Теорема Паскаля.[/b]
Если шестиугольник вписан в окружность либо любое другое коническое сечение ([b]эллипс[/b], параболу, гиперболу, даже пару прямых), то точки пересечения трёх пар противоположных сторон лежат на одной прямой.