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angle sum of polygon
Author:
Felix Yip Wing Chung
GeoGebra
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兩組對邊相等的四邊形
画直线等分三角形的面积
三位數除以一位數（一）
兩位數加法
找出對稱軸
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EnergyMath 2-3 複數乘法的幾何意義
Rectangle_04
分蛋糕
國旗 做很久的
凸透镜成像
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Geometric Distribution
Differential Calculus
Power Functions
Ellipse
Rhombus