What is the term for a ratio of a distance on a map to an actual ground distance is known as?

What is the term for a ratio of a distance on a map to an actual ground distance is known as?
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Answer :

It is know as the map's scale. For example, a map with a 1:50,000 (one to fifty thousand) means that one centimetre measured on the map, represent 50,000 centimetres on the ground.
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