The segment addition postulate explains the relationships between points on a line using distances and can be demonstrated with a real-world object like a ruler.
The segment addition postulate states that given two points A and C on a line, a third point B lies on the line between A and C if and only if the distances between the points satisfy AC = AB + BC. This can be modeled using a real-world object like a ruler where the total length of the ruler represents AC, and when you place two points marking AB and BC respectively, their combined lengths will equal the total length of the ruler, satisfying the segment addition postulate.
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