A scale is the ratio of the contracted or dilated form with respect to the original form (the ratio of the sizes before and after the scaling operation).
The scale factor is the magnitude of the scaling contraction or dilation (the shrinking or expanding) used in the scaling operation.
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None. The vertices, the scale factor as well as the centre of dilation can each be defined independently of the other two. Each different combination will result in a different image.
Scale factor and perimeter are related because if the scale factor is 2, then the perimeter will be doubled. So whatever the scale factor is, that is how many times the perimeter will be enlarged.
The areas are related by the square of the scale factor.
The scale factor is 1 to 150