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菱形有甚麼特性？
Author:
Anthony OR 柯志明
English version:
http://ggbtu.be/m79847
GeoGebra
New Resources
判斷球體
畫出對稱圖形
找出對稱軸
三位數除以一位數（一）
四邉形 (四年級) 教師版
Discover Resources
GGB5_3D:展開圖
認識函數值(隨機出題)
垂線性質2
對數的平移效果
S3 Trigonometry
等弧對等角
Discover Topics
Differential Equation
Surface
Special Points
Arithmetic Operations
Division