a heavy solid line used on a drawing to represent the outline of an object.
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In plane geometry a line is a two dimentional object between two points. If a line or a point is not on the line it, by definition, does not contain them. The answer therefor is infinite. Unless it is a closed line which has a slightly different definition but the answer is the same.
Angle of depression is defined as the angle between the horizontal line and the line joining the observer's line of sight to an object below the observer's eye sight. You can be on top of a building and an object is situated on the ground, and the angle between your horizontal line and the object is the angle of depression.
This is another definition of a line. It has only one dimension: infinite length.
In math, the definition of a supplementary line is A line where the two or more angles within the line equal 180 degrees.
Line configurations and the meanings assigned to these configurations are known as line conventions. Line conventions convey information as succinctly as a physical example of the object itself. The appropriate use of standard line conventions enables fabricators to replicate objects based solely on your drawing.