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證平行四邊形 (對角相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
圓周公式的應用
常见四边形是否是双心四边形
撒针估算面积实验
科氏力 (Coriolis Force)
比較五件物件的重量
Discover Resources
任務1
函数图像研究
Travelling Waves
垂心
根據百分率找數量（二）: 例1的副本
Discover Topics
Plane Figures or Shapes
Tangent Function
Special Points
Scatter Plot
Conic Sections