1. The problem statement, all variables and given/known data "If the circumference of a circle changes by a factor of 3, then its area changes by a factor of ____." 2. Relevant equations C=2*Pi*r A=Pi*r^2 3. The attempt at a solution I really don't know where to start. Recently I have been learning about the changing of factors and I'm having trouble. I do not understand where to start my problem and/or plug in numbers.If someone could give me a head start or a hint at how to approach this problem that would be great because I have many problems like this that I need to complete. Thanks.