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chen mingchuan
GeoGebra
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拼砌四邊形
兩組對邊相等的四邊形
直角坐標平面上的旋轉變換
四邉形 (四年級) 教師版
球體建築師
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內心
找中點的坐標
同位角---不平行綫
Illusion-内凹的正方形
S8G5 增加的小方格
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Diagrams
Hyperbola
Random Experiments
Parametric Curves
Logarithmic Functions