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形心

Author:Jensen Wong

Topic:Centroid or Barycenter

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四邊形的特性
拼砌四邊形
兩組對邊相等的四邊形
兩位數除以一位數（一）
三位數除以一位數（二）

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clock
Arcs and Angles at Centre/ Circumference 弧、圓心角與圓周角
優良作品1(沛綺)
畢氏定理
拋物線4--平行四邊形法

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Real Numbers
Scatter Plot
Symmetry
Orthocenter
Set Theory

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