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Author:
S CHOW
GeoGebra
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双心四边形
三角函数 的副本
科氏力 (Coriolis Force)
平行線的判定
折扣
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Arbelos
放缩尺
除法Q3
三角形全等的直观图(可重合).许兴华数学
初中数学
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Quadrilaterals
Circle
Circumcircle or Circumscribed Circle
Parametric Curves
Constructions