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西姆森线的性质定理——安宁定理
Author:
Sylvie
GeoGebra
New Resources
第八周作业3
讀磅
圓的切線方程
常见四边形是否是双心四边形
祖冲之的期望：内棋与外棋
Discover Resources
利用对称求线段和最值（移动端）
正多边形内接迭代
垂心問題
congruent (SSS) 2
External tangent
Discover Topics
Hyperbola
Upper and Lower Sum or Riemann Sum
Function Graph
Diagrams
Histogram