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Maps covering a large area suffer from "barrel distortion". In the usual layout of maps, East-West distances are compressed near the equator and exaggerated as you move towards the poles.
They are used to map points on a graph and are used to make real maps as well as graph probabilities and distances.
All rational numbers are fractional but all fractional numbers are not rational. For example, pi/2 is fractional but not rational.
write 18.575 in fractional notation
0.0475 in fractional form = 19/400