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橢圓關係
Author:
Martin Chang
GeoGebra
New Resources
錐體建築師
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
四邊形的特性
画直线等分三角形的面积
Discover Resources
try_111
分數比較
兩外切圓之外公切線作圖法
圈圈移動
金惠吉：三维李萨如
Discover Topics
Equations
Similar Triangles
Geometric Transformations
Cylinder
Calculus