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直线的倾斜角名词解释

更新时间: 2020-11-19 00:00:00     

平面直角坐标系内,当直线l与x轴相交时,取x轴作为基准,x轴正向与直线l向上方向之间所成的角a叫做直线l的倾斜角。当l与X轴平行或重合时,规定它的倾斜角为零度。

取值范围:0°≤α

关键词: 直线 倾斜角 名词 解释

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