The Geometry class taught in High School teaches you the basics of Euclidean Space. In two dimensions, two parallel lines will never intersect. Between any two points, there is a unique straight line.
We start by considering the equidistance of adjacent integers.
The distance between 6 and 7 is the same as the difference between 7 and 8. This is true for both the scientist working with centimeters and the engineer working with inches. This is one of the things alluded to when a mathematician talks about a space being flat.
How could it be anything else? Well, we create curvature when we try to graph the surface of Earth onto a piece of paper. The distortion shows up with Greenland looking much larger than Mexico even though the two areas are roughly the same size.
Vectoreverything 