How would I prove that two circles are similar? Would I use pi(r^2)? Would I dilate the circle or something?

Question

mynameisnemo · Answer

This seems kinda simple and I'm sure I'm over thinking it, I know that all circles are similar but i'm required to put an answer. It's open answer.

agent0smith · Answer

mynameisnemo · Answer

Oh wait one second, there's an image.

mynameisnemo · Answer

attachment

mynameisnemo · Answer

So, the radius for Circle E is 3 and the radius for circle C is 4.

mynameisnemo · Answer

so the scale factor is K=r^1/r^2?

mynameisnemo · Answer

sorry that looks like exponents, it should be
k=r1/r2
right?