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错觉3
Author:
树常青
GeoGebra
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第三周作业效果演示
椭圆内切圆链
第八周作业
第八周作业2
第八周作业3
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Proof2 周子翔
IMO2014C
Copy of 3S2 01a 平行四邊形 20151207
三角形
雙曲線諸元
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Sphere
Conic Sections
Reflection
Equilateral Triangles
Translation