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Author:
数豆豆
GeoGebra
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常见四边形是否是双心四边形
第三周作业效果演示
龙形曲线-分形龙2
撒针估算面积实验
斐波那契螺旋弧线（表格法-可动态调节）
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f(x, y) = g(x) h(y)
angle sum of polygon
Fraction(2)
伽利略比值II (Alfinio Flores & Hugh A. Sanders)
正N边形点列
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Centroid or Barycenter
Similar Triangles
Translation
Special Points
Right Triangles