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托勒密定理推廣到任意四邊形二
Author:
連琨銘
GeoGebra
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平行線的斜率
【案例】2013年安徽高考15题
祖冲之的期望：内棋与外棋
球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
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磁磚著色
立方體截痕
三角碎形
椭圆的定义
平面截圆锥面
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Linear Functions
Vectors
Quadratic Equations
General Quadrilateral
Conic Sections