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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
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Symmetric設計對稱圖案(一條對稱軸)斜2
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Discover Topics
Linear Equations
Square
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Geometric Mean
Cylinder