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梯形有甚麼特性？
Author:
Anthony OR 柯志明
English version:
http://ggbtu.be/m79855
GeoGebra
New Resources
柱體建築師
四邊形的特性
兩位數加法
兩位數除以一位數（一）
兩組對邊相等的四邊形
Discover Resources
複息的威力
教學－旋轉
DSE Circle-ACT01C Distance between Chords and Centre of a Circle
分段函数
弦的垂直線何時平分弦活動?
Discover Topics
Symmetry
Derivative
Polygons
Geometric Mean
Indefinite Integral