because it helps shows size relationship
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proportions are used in scale factors; scale factors ARE proportions
why is a scale important
Scale factors whose absolute values are greater than 1.
this is a 2 part answer, 1) your scaled factor is determined by the your map size, a "To" scale drawing is a percentage of the actual size of the object being drawn on the map 2) using autocadd for most drawings and draft's you typically draw the object at a 1:1 ratio, then apply the desired Scale (or scale factor) to fit the the desired paper size
It shows the distance a certain measurement equals on a map.