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几何模版：倍长中线
Author:
树常青
GeoGebra
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球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
判斷球體
畫出對稱圖形
【案例】2018年全国1卷理科12题
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範例：自製工具「格線」
Reference Angle 參考角
有趣的軌跡圖
rotational symmetry_4
Copy of sin(x) 的函數圖形
Discover Topics
Arithmetic Mean
Geometry
Vectors 2D (Two-Dimensional)
Fractions
Random Experiments