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GeoGebra
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撒针估算面积实验
常见四边形是否是双心四边形
异形操场
盈利與虧蝕
平行線的判定
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圓和弦圓和弦
簡單動畫
小阿樂
重疊法
正方体展开图的副本
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Histogram
Scalene Triangles
Volume
Cone
Trigonometry