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Author:
ken cheng
GeoGebra
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球体的体积推导(优化版)
画直线等分三角形的面积
兩位數除以一位數(二)
錐體建築師
三位數除以一位數(一)
Discover Resources
河內塔 (Tower of Hanoi)
Conic Sections
圓與直線
勝者即正義
两角和的余弦公式几何证明
Discover Topics
Prism
Rectangle
Cone
Rhombus
Planes