That's called the "distance" between the points.
the measure of a straight-line distance between two points is called length.
displacement
A line segment
displacement
A set of points on a straight line are called 'collinear points'.
the measure of a straight-line distance between two points is called length.
The length of a straight line between those two points.
displacement
Straight line
An interval. The short distance is the length of a straight line joining the two points.
A Straight Line is always the shortest distance between two points.
a straight line distance between two points is known as length. its SI unit is meter (m).
A line segment
displacement
Displacement.
Length or distance between two points.
A set of points on a straight line are called 'collinear points'.