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Circle Area (By Peeling!)
Author:
lu xinsheng
GeoGebra
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斐波那契螺旋弧线（表格法-可动态调节）
常见四边形是否是双心四边形
双心四边形
第八周作业1
第三周作业效果演示
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三角形內接正方形
regular tetrahedron (CH4)
點與圓的位置關係
Geometry: Types of Angles 2 (幾何：角的種類 2)
黃金矩形
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Means
Dilation
Planes
Probability
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