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椭圆的定义
Author:
GeoGebra Institute of WuXi
GeoGebra
New Resources
錐體建築師
兩組對邊相等的四邊形
画直线等分三角形的面积
拼砌四邊形
三位數除以一位數（二）
Discover Resources
強森定理強森定理
Sequence指令練習(二維3)
點之極線定理 / polar of a point theorem
正方体展开图的副本
祖暅原理
Discover Topics
Trigonometric Functions
Dilation
Straight Lines
Trapezium
Probability