三角形の極線が一直線上に並ぶことの証明

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• Offline Activity (.zip)

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  1. Aの極線がｆ。Bは接線上の点。Bの極線がｉ。Ｄも接線上の点。Ｄの極線がｋ。３極線と辺との交点ＥＦＧは一直線上に並ぶ。 (.ggb)