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四下：三角形内角和（折叠法）
Author:
钟秀群
GeoGebra
New Resources
折扣
斐波那契螺旋弧线（表格法）
科赫雪花
科氏力 (Coriolis Force)
正方形雪花图案
Discover Resources
excenter of triangle
四棱柱D'UN 的作品
极坐标
試繪
x^3+y^3-3xy
Discover Topics
Line Segment
Square
Cube
Derivative
Algebra