Entry Nº 032Stage 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 。周长是「边线的长」,别和圈住的「面的大小」混为一谈。
Where it comes from · where it goes
Prerequisites
What builds on it