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GeoGebra
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找出對稱軸
兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
近似值：有效數字
判斷球體
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前景圖、背景圖
Copy of 閱讀鐘面及數字鐘（時和分）
不規則圖形的周界(step3)
dragon(龙)
平面直角坐标系的构成
Discover Topics
Piecewise Functions
Vectors 2D (Two-Dimensional)
Rotation
Area
Triangles