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六上：圆的面积公式推导
Author:
钟秀群
Topic:
Circle
GeoGebra
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第八周作业
柱體建築師
判斷球體
找出對稱軸
拼砌四邊形
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範例:做出一平面方程式通過A(6,0,0),B(0,6,0),C(0,0,3)的平面方程式。
正七角錐(旋轉，實體、透視)
Example 4
異側AP+BP最小值
三角形相似的直观显示.许兴华数学
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Reflection
Special Points
Vectors
Ratios
Fractal Geometry