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欧拉线与三角形中心
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方程
GeoGebra
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斐波那契螺旋弧线(表格法-可动态调节)
龙形曲线-分形龙
小学资源收集
椭圆内切圆链
科赫雪花
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給三角形求正三角形
How to draw an ennegon with ruler and compasses?
wiki
劉徽的「割圓術」 的複本
异形操场
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Reflection
Pyramid
Tangent Function
Rotation
Exponential Functions