If the scale factor is r, then the new area will be the area of the original multiplied by r^2
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A scale factor requires two measures.
You find the scale factor on a triangle by dividing the short side by the long side.
Every part of the original scales by the same scale factor. By using a segment of the original you will determine the scale factor by dividing the length of the image by the length of the original.
if your looking up what the scale factor of 3 over 7 u must be dumb
a 1:1 ratio