by isolating one of the points connecting it against a known standard point like done in the case of determination of electrode potential
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No, because Of any three points on a line there exists no more than one that lies between the other two.
Two points are sufficient to uniquely determine a straight line. It is generally best to select point that are as far apart as possible. It is also a good idea to pick one extra point somewhere between the two extremes. It does not need t be exactly in the middle. This point acts as a check. If the three points are not in a straight line then there is an error in one of the calculations so you need to check back. If the points are in a line you should be OK. It is, of course, possible, that you made two (or more) matching errors but, hopefully, that is not very likely.
It would be a ray (one half of a line).In geometry "A set of points extending infinitely in one direction" is called a RAY.
One
horizontal line