A line at right angles to another line.
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a line or segment that is perpendicular to the given segment and divides it into two congruent segments
The definition of perpendicular lines also defines the angles -- perpendicular lines are two lines (or line segments) that meet at a 90 degree angle.
A horizontal line is perpendicular to a vertical line.
Perpendicular rays are two or more rays( part of a line that in one direction continues on) that meet at a right angle and will never meet again.
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.