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双中点模型(变式一）
Author:
谭伟
GeoGebra
New Resources
近似值：有效數字
四邊形的特性
拼砌四邊形
兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
Discover Resources
GeoGebra繪本
Constructing Quadrilaterals by Four Sides (2014)
Question 2(Angle)
GGB4
畢氏定理證明
Discover Topics
Statistical Characteristics
Plane Figures or Shapes
Curve Sketching
Polynomial Functions
Inequalities