A scale represents the relationship between a model and the actual measurement if the real object.
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There is no predetermined scale. You choose the scale so as to best represent the data.
a whole bunch of lines that represent miles
20 -:$:7
measuring the distances
Graphic and fractional scales are two different things. A graphic scale on a map is a line marked with the lengths which represent real distances. It has a zero at one end. A fractional scale simply gives the ratio between map and real distances, e.g. 1: 10 000, so zero doesn't come into it.