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There are two main uses of coordinates. The common use is to the location of a point in space which may be two dimensional or multi-dimensional. Maps are a good example of this use. Every place on earth has a unique latitude and longitude and that enables us to unambiguously locate places. Coordinate geometry also allows mathematicians to use results from algebra to solve problems in geometry.
You can learn how to get to somewhere using road maps,museum maps,and etc.
Maps.
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.
Distortion