How many points can two lines have in common? What is a line segment? Formulate the basic properties of measuring lines?

1) Two lines can have only one common point.
2) A segment is two points that are connected by a straight line.
3) Each segment has a certain length, which is greater than zero. The length of a segment is equal to the sum of the lengths of the parts into which it is divided by any of its points.



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