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四下：三角形内角和（折叠法）
Author:
钟秀群
GeoGebra
New Resources
龙形曲线-分形龙2
第三周作业效果演示
第八周作业
科氏力 (Coriolis Force)
龙形曲线-分形龙
Discover Resources
regular hexagon construction
圓柱
拋物線的兩切線
格子點
伽利略比值II (Alfinio Flores & Hugh A. Sanders)
Discover Topics
Arithmetic Operations
Plane Figures or Shapes
Calculus
Mathematics
Quadrilaterals