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平面几何中角是怎样定义的

更新时间: 2020-09-24 00:00:00     

从平面内一点出发的两条射线所组成的图形叫做“角”,这两条射线叫做角的边,它们的公共端点叫做角的顶点。角按大小可以分成五类:大于0度小于90度的角叫做锐角;等于90度的角叫做直角;大于90度小于180度的角叫做钝角;等于180度的角叫做平角;等于360度的角叫做周角。

关键词: 平面几何 怎样 定义

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