It is simply called the distance between the two points - simple as that. How that distance is measured will depend on the nature of the surface on which the two points are located as well as on the metric for measuring distance that is defined on that space.
The common metric in Euclidean space is the Pythagorean distance while on the surface of a sphere (like the Earth, for example), distances are measured along the great arc.
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The distance between 2 points is called a line. It is also called a line for the shortest distance between points.
In science there are usually infinitely many points between any two points so that there is no such thing as a consecutive point!
Distance=Sqrt[(x1-x2)^2+(y1-y2)^2]
If you mean points of (-2, -6) and (-2, 2) then it works out as 8
100 million meter is the distance between 2 points shot i don't think there exists a 2 point line, actuall, there is a 3 point line and any shoot performed within that line is taken as 2 point shot.
In a plane with the normal (x,y) coordinates, the usual distance formula is that the distance between (x1,y1) and (x2,y2) is √((x1-x2)2+(y1-y2)2). This can be extended to n dimensions by letting the distance between (a1,a2,a3,...,an) and (b1,b2,b3,...,bn) be √((a1-b1)2+(a2-b2)2+...+(an-bn)2)