It is: 3 to 2
12
12
Assuming the smaller sphere is the image of the larger sphere after transformation (based on the order of the radii): the scale factor is 4/12 = 1/3
It is: 21/12 = 7/4
It is: 2 to 3
12
It is: 2 to 3
Multiply each dimension by the scale factor:9 x 12 → (9 x 2.5) x (12 x 2.5) = 22.5 x 30
Tautologically!
You increase the scale factor.
The area scale factor is the square of the side length scale factor.
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.