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如何判断是否是长方形
更新时间: 2020-09-16 00:00:00  

四个角都是九十度的四边形。三个角是九十度的四边形。一个角是九十度的平行四边形。一组邻边相互垂直的平行四边形。

关键词: 如何 判断 是否 长方形

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