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滾動圓
Author:
eyun306
GeoGebra
New Resources
撒针估算面积实验
三角函数 的副本
双心四边形
龙形曲线-分形龙2
活动三：应用性质
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橢圓軌跡 (4)
Building Cylinders 建造圓柱體
畢氏定理證明（Ｉ）
錯角---不平行綫
中一︰棱柱的總表面面積-長方體的副本
Discover Topics
Hyperbola
Linear Programming or Linear Optimization
Line Segment
Means
Triangles