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DragonCurve_2018sep-2
Author:
David HUNG
GeoGebra
New Resources
常见四边形是否是双心四边形
撒针估算面积实验
圓的基本性質
双心四边形
平行線的斜率
Discover Resources
parallelogram
正方體的反射對稱3
九點共圓
垂直線的斜率_hui sir
軌跡練習1
Discover Topics
Ellipse
Trigonometry
Cosine
Conic Sections
Coordinates