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GeoGebra
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sanjiaohanshu
兩組對邊相等的四邊形
直角坐標平面上的旋轉變換
拼砌四邊形
近似值:有效數字
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角平分線作圖1213
布丰投针实验
Ellipse_Vertical
Lissajous curves(利薩如圖形)
点、线、角
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Cylinder
Prism
Coordinates
Perimeter
Percentages