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勾股定理
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GeoGebra
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平行線的判定
直線的斜率:水平變化 & 鉛垂變化
中华人民共和国国旗
撒针估算面积实验
折扣
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Travel Graph 行程圖
橢圓之極偶 / polarity for ellipse
密鋪圖形
堆疊正立方體的副本
分数减法 Fraction Subtraction
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Numbers
Orthocenter
Inequalities
Statistics
Means