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兩圓外公切線
Author:
郭逸民
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
畫出對稱圖形
兩位數除以一位數（二）
Discover Resources
扇形柱
Math
maze-temp
陳彤恩GGB 1/24
法線 (The Normal Line)
Discover Topics
Angles
Multiplication
Vectors 3D (Three-Dimensional)
Trapezium
Centroid or Barycenter