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退化的圓錐曲線
Author:
pingfeng.wu
GeoGebra
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拼砌四邊形
球体的体积推导
球体的体积推导（优化版）
兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
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P.4不規則圖形的周界
Q3-11
transformation_rotation
数学几何
正多边形内接迭代的副本
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Solids or 3D Shapes
Boxplot
Rectangle
Area
Quadratic Functions