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H形の裏返し
Author:
Naofumi Horio
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垂線の性質２
Friction and Movement
傍心の直極点の軌跡
ピタゴラスの定理（比で証明）
折り紙の折り目
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力の平行四辺形と天秤の原理 composition of force
回転行列
Noneuclid8-2
練習32(一次関数)
楕円に外接する三角形
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Quadrilaterals
Solids or 3D Shapes
Special Points
Plane Figures or Shapes
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