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平行四邊形的面積
Author:
whtong
GeoGebra
New Resources
多邊形的面積
平行線的斜率
漂亮的摇摆曲线
兩位數除以一位數（二）
圓的切線方程
Discover Resources
Trajectory of system: y'=sin(y)-y/2
barara magic stick
All in one (Centres of triangle)
編織圓
掷色子
Discover Topics
Ratios
Incircle or Inscribed Circle
Similar Triangles
Frequency Distribution
Vectors 3D (Three-Dimensional)