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Scale models of things like ships are replicas of the real thing - but built to scale.  If a model of a ship of 120 metres in length and with a beam of 20 metres was to be built, the first thing the model maker would do would be to work out a scale.  Which scale would you use?   1cm: 1m; or 1cm: 10m?  Which scale would produce the bigger model?  Would either scale model fit in a bottle?

Scale

The same notion of scale applies to maps.  Scale can be shown on TOPOGRAPHIC MAPS in 3 ways:

 

1.  Scale can be shown as a statement in words:  one centimetre to one kilometre

 

2.  Scale can be shown as a representative fraction or ratio:  1/100,000 or 1:100,000

 

In case of a representative fraction, the numerator represents the number of units on the map and the denominator represents the number of units on the ground.

 

3.  Scale can be shown as a line or linear scale.  In this case the distance between two points on a map can be directly transferred to the line scale.  The real distance can then be read in metres or kilometres.

 

 

 

Sometimes the first section of a line scale is divided into fractions.  Sometimes all sections are divided into fractions.  What distance does each fraction represent on the above scale?

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