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同旁內角---垂直平行綫
Author:
chanfushun
GeoGebra
New Resources
拼砌四邊形
找出對稱軸
兩位數除以一位數（二）
算柱 (兩位數)
GeoGebra笔记功能体验课件
Discover Resources
Circle
座標變換_數線
三次函數
grass eating
单叶双曲面-双叶双曲面
Discover Topics
Pyramid
Geometric Mean
Linear Programming or Linear Optimization
Differential Equation
Upper and Lower Sum or Riemann Sum