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平行四邊形有甚麼特性？
Author:
Anthony OR 柯志明
Topic:
Parallelogram
English version:
http://ggbtu.be/m79826
GeoGebra
New Resources
畫出對稱圖形
兩組對邊相等的四邊形
三位數除以一位數（二）
判斷球體
兩位數除以一位數（二）
Discover Resources
lab5_task3
動態文字2次函數
如何判斷曲線夠不夠圓
蝴蝶定理
異分母分數加法
Discover Topics
Straight Lines
Correlation
Random Experiments
Right Triangles
Hyperbola