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三角形と四角形
Author:
smktsp1201
GeoGebra
New Resources
standingwave
カージオイド
等積変形2
平均変化率
接点の作る円は内接円
Discover Resources
傍心と内心
直線上の点、垂線の足
直線のベクトル方程式（点Pの存在範囲）
楕円の外接六角形！
GHS1231
Discover Topics
Perimeter
Derivative
Circumcircle or Circumscribed Circle
General Quadrilateral
Angles