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Author:
kelly_hagan
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圆内6个大小不等的小圆
旋转得圆台
赵爽弦图
交集
Pendulum simulations
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Problem #5
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Zlati rez, potenca... enačba... 1
Converse of Pythagoren Theorem
The table of 9 using the tens
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Similar Triangles
Ellipse
Quadratic Functions
Pyramid
Plane Figures or Shapes