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中垂线是指垂直于线段中点的直线,其性质、定义和判定如下:1.性质:(1)中垂线上任意一点到线段两端点的距离相等;(2)中垂线将线段分成两个相等的部分;(3)中线所在直线与线段垂直。2.定义:线段的中垂线是指与这条线段的中点重合且垂直于这条线段的直线。3.判定:(1)中点法:连接线段两端点的线段的中点和线段两端点形成的三角形,三角形中线对应的直线即为中垂线。(2)垂线法:从线段的某一端点引一条与另一端点相连成垂直的直线,则该直线即为中垂线。(3)反演法:将线段所在线平面反演,则线段中点被反演到无穷远点,线段所在直线被反演到通过无穷远点的圆,线段上任意一点所对应的圆弧被反演到以向量与该点相反的向量为半径的圆,线段的中垂线在反演后变为该圆上两点所在的直线。