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illusion若隐若现的白点（星海）
Author:
吴兴海
GeoGebra
New Resources
斐波那契螺旋弧线（表格法-可动态调节）
折扣
圓的基本性質
龙形曲线-分形龙2
科赫雪花
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四邊形
九點圓的真正面貌
斜線2
External tangent
球面截痕
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Diagrams
Piecewise Functions
Circumcircle or Circumscribed Circle
Rectangle
Triangles