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六上练习：时钟轨迹问题
Author:
肖昆明
GeoGebra
New Resources
撒针估算面积实验
圓的基本性質
直線的斜率：水平變化 & 鉛垂變化
第八周作业
异形操场
Discover Resources
旋轉的概念
橢圓練習
Geometric Solids: Recognize, Name and Sort
Newton's method
题1
Discover Topics
Perimeter
Solids or 3D Shapes
Parallelogram
Means
Angles