The line perpendicular to a surface at a point is called the normal
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Intersecting Lines
If the line has a slope of 2, then the perpendicular line has a slope of -1/2. The slope of a perpendicular line is the negative reciprocal. Another example would be if the slope of a line is -1/4, then the slope of the perpendicular is 4.
The perpendicular bisector of a line segment AB is the straight line perpendicular to AB through the midpoint of AB.
'altitude' or perpendicular. If on line is the base (horizontal) line, then the line that is a 90 degrees to it is the perpendicular/altitude.
The slope of a perpendicular line is not defined.