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Author:
Jianqiang He
GeoGebra
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兩組對邊相等的四邊形
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
判斷球體
四邉形 (四年級) 教師版
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waaachen
生活中的平面圖形問題2
Copy of 劉徽的「割圓術」
tan900
迭代多角星
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Similarity Transformation or Similarity
Step Functions
Geometry
Special Points
Quadratic Equations