It means that you increase something's height by x2 and its width by x2 (and depth by x2 when you have a 3D object)
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The scale factor is 1 to 150
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.
For areas: Square the Scale Factor.
kotha
The scale factor is 3:1