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Author:
吕玉雷
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
球体的体积推导（优化版）
画直线等分三角形的面积
球體建築師
兩組對邊相等的四邊形
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Angle at Centre Twice Angle at Circumference
判斷三角形
馬奔跑
二元线性规划的图解法(18.2 例4)
七巧板（tangram）的副本
Discover Topics
Power Functions
Cosine
Surface
Geometry
Incircle or Inscribed Circle