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圓外切四邊形
Author:
李春培
Topic:
Circle
GeoGebra
New Resources
近似值：有效數字
sanjiaohanshu
Fibonacci Clock
小数 的副本
兩組對邊相等和有直角的四邊形
Discover Resources
三條線上的三角形
不規則圖形填入斜線
圓與切線
勾股定理的证明
Quiz on Addition and Subtraction of Directed Numbers (2)
Discover Topics
Area
Parametric Curves
Normal Distribution
Standard Deviation
Variance