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旋转：滚动
Author:
Peng Yu
GeoGebra
New Resources
折扣
撒针估算面积实验
科赫雪花
平行線的判定
第八周作业
Discover Resources
基測試題旋轉
直線方程軌跡
七巧板
圓上的角任務(三): 同弓形內的圓周角
Pyth2LK
Discover Topics
Arithmetic
Sphere
Isosceles Triangles
Quadratic Functions
Piecewise Functions