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圆链的反演
Author:
孟宝兴
GeoGebra
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三位數除以一位數（二）
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
判斷球體
四邊形的特性
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題 5
斯坦納-雷米歐司(Steiner-Lehmus)定理推廣
ie 1
平行四邊形
活動工作紙LEVEL03
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Cuboid
Secant Line or Secant
General Quadrilateral
Calculus
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