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同位角__水平平行綫
Author:
chanfushun
GeoGebra
New Resources
四邊形的特性
兩組對邊相等的四邊形
近似值：有效數字
拼砌四邊形
畫出對稱圖形
Discover Resources
平移法（三）
GeoGebra研習作品
My First GGBBook
橢圓規Ellipsograph (Trammel of Archimedes)
漂亮的摇摆曲线
Discover Topics
Boxplot
Power Functions
Plane Figures or Shapes
Right Triangles
Logarithmic Functions