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视觉差，平行线
Author:
汪丽
GeoGebra
New Resources
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
錐體建築師
四邉形 (四年級) 教師版
Discover Resources
Test1
angles sum on a striaght line
y=x sin(1/x) 的圖形
勝者即正義，可愛即正義~
reflection points
Discover Topics
Secant Line or Secant
Cylinder
Differential Equation
Exponential Functions
Perimeter