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劉虹圻 垂心
Author:
呂麗珠
Topic:
Orthocenter
GeoGebra
New Resources
錐體建築師
兩位數除以一位數（二）
柱體建築師
找出對稱軸
兩組對邊相等和有直角的四邊形
Discover Resources
分形几何欣赏初步：树型图
Sequence指令練習(逐一套疊正方形)
Apollonius Problem gergonne 3
Compare areas by cutting shapes Q3
黎曼和的副本
Discover Topics
Parallelogram
Integral Calculus
Line Segment
Secant Line or Secant
Centroid or Barycenter