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五点共圆
Author:
彭逸飞
GeoGebra
New Resources
科赫雪花
圓的切線方程
正方形雪花图案
折扣
圓的基本性質
Discover Resources
Heidi Lin - Conic Section
中間人星星
題四
構作放大圖形
同角三角函数的基本关系（正六边形记忆法）
Discover Topics
Statistical Characteristics
Definite Integral
Straight Lines
Equilateral Triangles
Right Triangles