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分形几何欣赏初步：树型图
Author:
王俊辉
按逆时针方向，点选直角三角形直角边两点，构建新的图形。
GeoGebra
New Resources
找出對稱軸
四邊形的特性
三位數除以一位數（二）
柱體建築師
球體建築師
Discover Resources
以量角器量度角
直方圖_Demo
平行線
translation
動畫的根本animation of root
Discover Topics
Cosine
Linear Programming or Linear Optimization
Reflection
Similar Triangles
Coordinates