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轨迹20
Author:
万超杰
GeoGebra
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平行線的判定
撒针估算面积实验
双心四边形
斐波那契螺旋弧线（表格法-可动态调节）
折扣
Discover Resources
路徑二動畫
三角形內心
四邊形層疊
CIRCLE
Angles in a Circle:Property 2
Discover Topics
Plane Figures or Shapes
Quadratic Functions
Vectors 3D (Three-Dimensional)
Addition
Equilateral Triangles