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黄金螺线
Author:
许业成
GeoGebra
New Resources
异形操场
斐波那契螺旋弧线（表格法-可动态调节）
第三周作业效果演示
第八周作业1
中华人民共和国国旗
Discover Resources
Apollonius Problem 10 CCC wiki
How to draw a hexagon with ruler and compasses?
全等—正方形的旋转
平面截圆锥
伞骨架模型
Discover Topics
Symmetry
Centroid or Barycenter
Rhombus
Curve Sketching
Histogram