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GeoGebra
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GeoGebra
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fcg图2
Author:
符成岗
GeoGebra
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平行線的判定
盈利與虧蝕
比較五件物件的重量
撒针估算面积实验
三角函数 的副本
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play tennis
螺線相似正N邊形
題一
正六邊形串珠
正方形纸片剪出正三角形（顶点在边上）
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Special Points
Trigonometric Functions
General Quadrilateral
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Cube