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三角形の外心内心垂心重心
Author:
murakami.kazuhiro
GeoGebra
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平均変化率
サイクロイド
直線の軌跡
対数螺旋
standingwave-reflection
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円周角と中心角（a circumferential angle and a central angle）
y=axのフーリエ展開
中点連結 四角形
GHS3415
合同な図形２
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Centroid or Barycenter
Symmetry
Parametric Curves
Straight Lines
Vectors 2D (Two-Dimensional)