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angle between lines
Author:
johnmayhk
GeoGebra
New Resources
找出對稱軸
三位數除以一位數（一）
兩位數除以一位數（二）
拼砌四邊形
算柱 (兩位數)
Discover Resources
正方體
畢氏定理
多边形对角线
猴子爬樹
projection02 by Mr LO WY
Discover Topics
Conic Sections
Parametric Curves
Percentages
Binomial Distribution
Continuity