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Scale drawings are used by artists, architects and builders to get an accurate drawing either smaller or larger than the actual thing is.
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
Not all drawings are done to scale, sketches of buildings and people for instance. However if it is a technical drawing the draughtsman/woman will state on the drawing the scale used.
for showing a preview, or planning, without actually building the real structure
proportions are used in scale factors; scale factors ARE proportions