In order to plot the plan view of the terrain or structure.
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A horizontal line has a slope of zero. The equation of a horizontal line is y = a.
Yes, it is true; slope zero is no slope.
Well since the lines are parallel they would have the same slope. And the slope of any horizontal line is 0. The slope of a vertical line is undefined.
a slope of zero. horizontal is undefined
Horizontal lines always have a slope of zero. (i.e completely flat, level surfaces have a slope of zero). However a line does not have to have a slope of zero in order to be a line.