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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
兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
異分母分數減法
第八周作业
兩位數除以一位數（一）
Discover Resources
奠基
放射狀旋轉圖形(2)
Copy of 仙后座找北極星1
計算圓弧長度
數織Nonogram
Discover Topics
Confidence Interval
Rectangle
Stochastic Process or Random Process
Reflection
Matrices