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硬幣

Author:Tse Sir

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兩組對邊相等和有直角的四邊形
四邊形的特性
兩位數加法
【案例】2018年全国1卷理科12题
拼砌四邊形

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Perigal's Dissection
Linear Programming
長方形的對稱軸
椭圆的两条垂直切线的交点轨迹蒙日圆
勾股定理证明演示--分割股边

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Centroid or Barycenter
Tangent Line or Tangent
Geometric Mean
Surface
Function Graph

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