The line perpendicular to a barrier is called the normal.
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Slopes of line perpendicular to the x-axis are undefined.
A horizontal line is perpendicular to a vertical line.
Such a line is called a perpendicular bisector.
The perpendicular postulate states that if there is a line, as well as a point that is not on the line, then there is exactly one line through the point that is perpendicular to the given line.
Line L is parallel to line n.