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异面直线的夹角
Author:
杜耀宗
Topic:
Solids or 3D Shapes
GeoGebra
New Resources
球体的体积推导
探究三角形的全等條件
三位數除以一位數（二）
兩位數加法
圓的切線方程
Discover Resources
平行四邊形有甚麼特性？
車線.ggb
Quiz on Solving Right Triangles (Finding Side Lengths) 解直角三角形：測驗1（求邊長）
three circle touching each other
對鄰邊之對
Discover Topics
Vectors 3D (Three-Dimensional)
Median Value
Division
Logic
Parallelogram