A sole line can't be perpendicular. To be perpendicular, a line has to meet with another line, to form right angles on either side. Perpendicular is the exact opposite of parallel.
Parallel: =
Perpendicular: -|
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perpendicular lines line that cross together, but all four corners form a right angle
A line is perpendicular to another line when it is at an angle of 90° to the other line. + (that plus sign is an example of a perpendicular line)
A line is perpendicular to a plane when it is perpendicular on two lines from the plane
A perpendicular line is one that is at right angle to another - usually to a horizontal line. A perpendicular bisector is a line which is perpendicular to the line segment joining two identified points and which divides that segment in two.
A perpendicular line is 90 degrees. Anything less or more is not perpendicular.
The difference between a perpendicular line and a parallel line is that a perpendicular line crosses or joins, while a parallel line doesn't touch at all.