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平角有几个顶点有几条边

更新时间: 2020-06-30 00:00:00     

平角是个角,它符合角的定义,是由一个顶点和两条边组成的。定义:一条射线绕它的端点旋转,当始边和终边在同一条直线上,方向相反时,所构成的角叫平角。平角等于180度,是角的两边成一条直线时所成的角。

关键词: 平角 顶点

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