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同旁內角---不平行綫
Author:
chanfushun
GeoGebra
New Resources
找出對稱軸
算柱 (兩位數)
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
錐體建築師
Discover Resources
三角形的外心
Trajectory of system: y'=sin(y)-y/2
多項式函數
題四
Copy of 周界
Discover Topics
Variance
Means
Parametric Curves
Quadratic Equations
Scalene Triangles