Each linear dimension is altered by a multiple which is the scale factor.
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If it is a 2-dimensional figure then it is proportional.
# is the ratio of the demensions in the drawing to the corresponding actual dimensions. The scale factor for a scale drawing is the ratio of the dimensions in the drawing to the corresponding acual bimensions.
Scale Factor
The area changes by the square of the same factor.
You need information about a pre-image AND and image to work out a scale factor.