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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
New Resources
錐體建築師
兩位數加法
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
Discover Resources
翻轉方塊
數學傳播39卷4期, 平面幾何公式思考
圖形2
纏繞畫1
存款模擬程式
Discover Topics
Quadratic Equations
Isosceles Triangles
Volume
Rhombus
Similarity Transformation or Similarity