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
10 metres is 1000 times as large as 1 centimetre. Therefore in this scale, one unit (whatever that unit may be) must actually represent the same unit times 1000. So, for example, a model of a building which in reality is actually 33 metres high, to this scale, would be 0.033 metres or 3.3cm high.