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Centres in a Triangle(三角形的中心)
Author:
chisunch1
GeoGebra
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【案例】2018年全国1卷理科12题
【案例】2013年安徽高考15题
平行線的斜率
漂亮的摇摆曲线
祖冲之的期望：内棋与外棋
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angle
ex 8
兩圓滾動軌跡
量角器
Discover Topics
General Quadrilateral
Linear Programming or Linear Optimization
Prism
Planes
Incircle or Inscribed Circle