a normal
The line perpendicular to a barrier is called the normal.
the line is called the normal
The line perpendicular to a surface at a point is called the normal
It's called a perpendicular bisector of the line segment.
A line that is at 90 degrees to another line is called a perpendicular line. Perpendicular lines intersect at right angles (90 degrees) forming a "L" shape.
'two perpendicular number lines are called'Special:Search
Perpendicular bisector.
Slopes of line perpendicular to the x-axis are undefined.
A tangent.
a tangent
The horizon runs horizontal. Perpendicular to that is VERTICAL.
The line perpendicular to a reflecting surface where the incident ray ends and the reflected ray begins is called the normal line.