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外心

Author:myworid

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拼砌四邊形
找出對稱軸
画直线等分三角形的面积
GeoGebra笔记功能体验课件
兩位數加法

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已知正三角形內部一點到三頂點距離求面積
Activity 1
Net of pyramid
密鋪2
三等分点连线围成的三角形特征（唐老师）

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Multiplication
Confidence Interval
Cuboid
Tree Diagrams
Trigonometry

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