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Poncelet point : ウィキペディア英語版 | Poncelet point
In geometry, the Poncelet point of four given points is defined as follows: Let ''A'', ''B'', ''C'', and ''D'' be four points in the plane that do not form an orthocentric system. The nine-point circles of triangles ''ABC'', ''BCD'', ''CDA'', ''DAB'' meet at one point, the Poncelet point of the points ''A'', ''B'', ''C'', and ''D''. If ''A'', ''B'', ''C'', and ''D'' be four points in the plane that form an orthocentric system then triangles ''ABC'', ''BCD'', ''CDA'', ''DAB'' all share the same nine-point circle. ==References==
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抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Poncelet point」の詳細全文を読む
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