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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
New Resources
找出對稱軸
GeoGebra笔记功能体验课件
拼砌四邊形
第八周作业
錐體建築師
Discover Resources
有向角
比較圖形大小2
立體三角測量(例六)
数学分析讲义
元旦快乐（制作：孟宝兴）
Discover Topics
Pie Chart or Circle Chart
Differential Calculus
Inequalities
Arithmetic Operations
Median Value