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Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.geogebra.hk
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圓的基本性質
直線的斜率
常见四边形是否是双心四边形
百分數及其應用
多邊形的面積
Discover Resources
會動的數據*3
平行四邊形
橢圓重心軌跡1
等弦則等弦心距
拋物線相似
Discover Topics
Linear Regression
Symmetry
Planes
Mode
Centroid or Barycenter