Terms  Definitions 

Segment 
The set consisting of the distinct points A and B and all points between A and B

Ray 
The ray with endpoint A containing B is the union of the line AB and the set of all points for which B is between each of them and A

Opposite Rays 
Ray AB and ray AC are opposite rays if and only if A is between A and C

Uniqueness Property 
On a line, there is a unique distance between two points

Distance Formula 
if two points on a line have coordinates x and y, the distance between them is the absolute value of xy

Additive Property 
If B is on line AC, then AB + BC = AC

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