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1.5 to 1
it becomes smaller
Tautologically!
75%= .75 = 3/4 So, to scale it down, it was multiplied by a factor of 3/4. To get it back up, divide by 3/4 (which is to say, multiply by 4/3 = 1.3333 = 133.33%
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.