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GeoGebra
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平行線的斜率
圓周公式的應用
多邊形的面積
兩位數加法
球体的体积推导
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Dilation of area
Copy of 梯形
正方形旋转夹脚45_原题
S408 Penrose 階梯
模拟时钟
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Percentages
Mode
Geometry
Frequency Distribution
Equilateral Triangles