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領結的角度
Author:
周桂名
角度和不變
GeoGebra
New Resources
画直线等分三角形的面积
兩位數除以一位數（一）
異分母分數減法
兩位數加法
漂亮的摇摆曲线
Discover Resources
圓交與公切線
九點圓
錯角練習
正弦函数自变量的几何显示
〃One〃
Discover Topics
Set Theory
Solids or 3D Shapes
Function Graph
Boxplot
Vectors 2D (Two-Dimensional)