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公切線的引入
Author:
Gideon Huang
Topic:
Geometry
GeoGebra
New Resources
畫出對稱圖形
第八周作业
兩組對邊相等的四邊形
兩位數除以一位數（一）
四邉形 (四年級) 教師版
Discover Resources
How to draw an ennegon with ruler and compasses?
奈格爾點
滾球平台
圆内接与圆外切多边形
用向量找北极星
Discover Topics
Tangent Function
Stochastic Process or Random Process
Cuboid
Scalene Triangles
Means