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Mathin
Entry032Stage 2 · Grades 3–4图形与几何

周长

封闭图形一周的长度。

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Definition

沿着封闭图形的边线走一圈的长度,叫它的周长。长方形周长 =(+)×2=(长+宽)\times2。周长是「边线的长」,别和圈住的「面的大小」混为一谈。

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