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多邊形外角和
Author:
Gideon Huang
GeoGebra
New Resources
兩組對邊相等的四邊形
直角坐標平面上的旋轉變換
判斷球體
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
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Demo
國中(1-1等線段作圖)
parallel
pic2-6一次函数的副本
平方數平方數的副本
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Special Points
Matrices
Hypothesis Testing
Root
Conic Sections