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錯角---垂直平行綫
Author:
chanfushun
GeoGebra
New Resources
算柱 (兩位數)
兩組對邊相等的四邊形
四邊形的特性
柱體建築師
三位數除以一位數（一）
Discover Resources
COS 特別角
testing
分段移動
椭圆的定义的副本
展開圓面積 (講義版)的副本
Discover Topics
Diagrams
Sphere
Vectors 2D (Two-Dimensional)
Trapezoid
Similarity Transformation or Similarity