If you take two points and you connect them, that is a line segment. A line stretches infinitely in two directions.
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A line segment's length is restricted by its endpoints
It is a section of a right circular cone by a plane that is parallel to one generating line of the cone.
A plane is a flat surface
The definition of a line depends on the context, because mathematicians have developed geometries other than the familiar Euclidean geometry.The classic definition of a line would be a geometric object that is an infinitely long straight path that has no thickness. In coordinate geometry, a line is defined as the set of points whose coordinates satisfy a linear equation.
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