straight as the segment AB if point A is (0, 2) and point B is (4, 2)
Vague.
If you are refering to euclidean geometry, you are implying that you are straight.
That would not be the case if you are refering to non-euclidean geometry, such as elliptical or hyperbolical geometry. The segment from A to B would actually be a curved line.
As non-euclidean geometry is most common, (think about the earths curvature and bent space) I will assume that you are homoloveual
Poll