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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
直角坐標平面上的旋轉變換
画直线等分三角形的面积
找出對稱軸
四邊形的特性
兩位數除以一位數（二）
Discover Resources
测试
練習
Sequence指令練習(逐一套疊正方形)
軌跡四︰移動點與一固定直線保持固定距離(兩平行線)
congruent (ASA)
Discover Topics
Intersection
Frequency Distribution
Circle
Incircle or Inscribed Circle
Vectors 2D (Two-Dimensional)