This question is an illustration of the distance postulate.
The complete text is: <em>Between every pair of distinct points, there is a positive unique number called the </em><em>distance</em>
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Take for instance, two distinct points A and B.
The number that measures the length of A and B is called the distance between A and B.
Assume that:
- <em>A is at point 1</em>
- <em>B is at point 6.</em>
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The positive number (i.e. the distance) between A and B would be:



<em>Hence, the positive unique number is called the distance (and this is supported by the distance postulate).</em>
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Read more about distance postulate at:
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