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mooc第四讲椭圆反射
Author:
单晨
GeoGebra
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兩組對邊相等的四邊形
【案例】2013年安徽高考15题
四邊形的特性
畫出對稱圖形
画直线等分三角形的面积
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xcxzczxczxczxczxczxc
動畫的根本animation of root
中研院數學所
球體表面積
圆锥曲线的统一画法.许兴华数学
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General Quadrilateral
Tangent Line or Tangent
Kite
Solids or 3D Shapes
Incircle or Inscribed Circle