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四边形外角和
Author:
陈宜红
Topic:
Geometry
GeoGebra
New Resources
第三周作业效果演示
撒针估算面积实验
斐波那契螺旋弧线（表格法）
龙形曲线-分形龙
科赫雪花
Discover Resources
塗色
Rotational Symmetry - Octahedron
折紙畫橢圓
斯霍滕(Schooten)定理(與角平分線定理等價)
o'clcok
Discover Topics
Numbers
Reflection
Arithmetic Operations
Ellipse
Volume