Question

When the scale factor between two circles is “x” the scale factor between the 1_________________________is also “x” and the scale factor of the _________________________is “x2”

Answer 1

When the scale factor between two circles is “x” the scale factor between the radius is also “x” and the scale factor of the area is “x^2"

this is only one possible answer. For example, instead of radius, you could have put diameter or circumference.