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The Isogonic Center
Author:
代国兴
GeoGebra
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双心四边形
第八周作业1
盈利與虧蝕
斐波那契螺旋弧线（表格法）
平行線的判定
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題三
四心的變化II
物件平移的概念
太极图
圓周公式應用題2的副本
Discover Topics
LCM and GCD
Sphere
Vectors 3D (Three-Dimensional)
Quadrilaterals
Symmetry