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A vertical line!
The name of a vertical line is simply named by the number on the x axis it is on.
The vertical axis. In 2-d coordinate geometry it would be the y axis, in 3-d it would be the z-axis.
name one pair of perpendiclur line segments?
A vertical line has an undefined slope. For the line to be parallel to a vertical line, the slopes would have to be the same. Therefore, the line parallel to a vertical line also has an undefined slope.