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angle between lines
Author:
johnmayhk
GeoGebra
New Resources
四邊形的特性
畫出對稱圖形
兩位數除以一位數（一）
柱體建築師
三位數除以一位數（一）
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trigonometry1
圓錐截痕
group m
展開圓面積 (講義版)的副本
求切线方程(改进)
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Matrices
Geometric Mean
Mode
Solids or 3D Shapes
Fractal Geometry