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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
GeoGebra笔记功能体验课件
判斷球體
画直线等分三角形的面积
四邊形的特性
三位數除以一位數（一）
Discover Resources
科學記號
Geometry: Angles Sum of Triangle (幾何：三角形內角和)
認識直徑
太陽系的奧秘
函数作图工具的副本
Discover Topics
Unit Circle
Incircle or Inscribed Circle
Pythagoras or Pythagorean Theorem
Ellipse
Cuboid