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Author:
Sylvie
GeoGebra
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圓的基本性質
双心四边形
折扣
撒针估算面积实验
直線的斜率：水平變化 & 鉛垂變化
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數學4其他圖
直線系
鋪地磚(六邊形)
Slope
Locus (Segment)
Discover Topics
Function Graph
Linear Functions
Area
Circle
Orthocenter