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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
兩位數除以一位數（一）
判斷球體
找出對稱軸
球體建築師
球体的体积推导
Discover Resources
Polygon Activity
Copy of 固定周界的長方形的面積變化
高美溼地
CircleIII
畫三角形 題1a 的複本
Discover Topics
Equilateral Triangles
Combinatorics
Constructions
Fractions
Arithmetic