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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
兩組對邊相等的四邊形
異分母分數減法
直角坐標平面上的旋轉變換
畫出對稱圖形
兩位數除以一位數（二）
Discover Resources
分數的加法
扇形弧長公式3
圓形移動面積
正十二面體裁邊 (Chamfered Dodecahedron)
初中几何证明
Discover Topics
Mode
Tree Diagrams
Standard Deviation
Equilateral Triangles
Translation