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.
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In math, the definition of a supplementary line is A line where the two or more angles within the line equal 180 degrees.
A horizontal line is a line that is parallel to the horizon.
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.
The definition of a non-collinear line is that this is a line on which points do not lie on one line. The opposite of this is a collinear point. Collinear points refer to three points that do fall on a straight line.
a line segment has no area. By definition a line segment is a part of a line, thus it has no area