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三垂線
Author:
Wu Xiao-Ren
GeoGebra
New Resources
兩位數加法
三位數除以一位數（二）
錐體建築師
兩位數除以一位數（二）
算柱 (兩位數)
Discover Resources
對稱和變換
Viviani's curve
找找看三角形外接圓的圓心在哪？
認識分數
同心圓
Discover Topics
Area
Root
Incircle or Inscribed Circle
Linear Functions
Ellipse