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任务12：手拉手模型
Author:
陈丽婷
GeoGebra
New Resources
双心四边形
科赫雪花
撒针估算面积实验
科氏力 (Coriolis Force)
第八周作业
Discover Resources
圓周角與弦切角
俄羅斯方塊
巴拉拉能量
正四面體
勾股定理的毕氏证明
Discover Topics
Inequalities
Upper and Lower Sum or Riemann Sum
Polygons
General Quadrilateral
Straight Lines