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Contour lines connect points of equal elevation while isobars connect points of equal pressure
In Euclidian or plane geometry, there can be only one line through two fixed points. Lines cannot actually be drawn; if you see it it is not a geometric line. If the points are on a curved surface as in a geometry that is non-Euclidian, then there can be infinitely many lines connecting two points.
any mathematical process is called an operation
the parallel lines never intercept so they do not have any common points.