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周期1
Author:
不离不弃
GeoGebra
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圓周公式的應用
垂直線的斜率
三角函数 的副本
盈利與虧蝕
常见四边形是否是双心四边形
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圓的基本慨念
等周長的扇形與矩形
四次函數圖形&反曲點
Properties of a Rectangle
邊角關係
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Constructions
Special Points
Logic
Geometric Mean
Diagrams