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正三角形繞正方形旋轉
Author:
AlexWang
GeoGebra
New Resources
三位數除以一位數（一）
兩位數除以一位數（一）
異分母分數減法
兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
Discover Resources
三角形內心
數學傳播39卷4期, 平面幾何公式思考
圓繞圓內外
Copy of 平行四邊形面積
Copy of 劉徽的「割圓術」
Discover Topics
Rational Numbers
Similarity Transformation or Similarity
Continuity
Equilateral Triangles
Plane Figures or Shapes