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Author:LAM YU SANG

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兩組對邊相等的四邊形
GeoGebra笔记功能体验课件
四邊形的特性
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形

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三角形內角和
三角形四心
Normal Vector
體積
三角函数的概念核心知识点

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Means
Symmetry
Kite
Division
Rotation

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