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why is a scale important
because it helps shows size relationship
A reference point on the map is allocated to a reference point from the "real world". For every other point in the real, the direction of its image from the map's reference point is the same as the direction of the point in reality but the distance is the true distance divided by the scale factor. When all points have been so plotted, you will have a map or scale drawing.Because scaling is a linear transformation, the image of a straight lines will be a straight line so it is sufficient to find the images of the end points and join them together - rather than find the image of each point on the line.
It shows the distance a certain measurement equals on a map.
Note the range and size of the scale values