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the scale factor is 4.5 just divide the numbers 18/4 = 9/2 = 4.5 27/6 = 9/2 = 4.5
With similar objects (where one is an exact scale version of the other) then if the linear measurements are in the ratio 2 : 3 then the areas are in the ratio 22 : 32 which equals 4 : 9. So if the sides of two triangles have a scale factor of 2/3 then the areas have a scale factor of 4/9.
all you have to do is put 1 inch over 9 feet. Example : 1/9
Factor out common factors. 9/12 factor out a 3 3*3/3*4 3 as a factor top and bottom, at least once, can be canceled = 3/4 ===================
8/18 factor out a 2 = 4/9 ====