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小球在斜面上摩擦力方向变化演示
Author:
向霖 蔡
GeoGebra
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錐體建築師
兩組對邊相等和有直角的四邊形
四邊形的特性
球体的体积推导(优化版)
【案例】2013年安徽高考15题
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Rotation 旋轉變換
空間中兩向量夾角
互化
In-centre
圆的有关概念
Discover Topics
Centroid or Barycenter
Symmetry
Sine
Circumcircle or Circumscribed Circle
Tangent Function