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勒洛四面体（参数曲面法）
Author:
孟宝兴
GeoGebra
New Resources
圓的基本性質
双心四边形
折扣
撒针估算面积实验
龙形曲线-分形龙2
Discover Resources
橢圓與雙曲線折紙
線性規劃
簡單拋物線
Pappus古定理證明
整式乘法-平方差公式
Discover Topics
Equilateral Triangles
Cone
Mode
Similarity Transformation or Similarity
Circumcircle or Circumscribed Circle