There is a constant ratio between corresponding sides of similar figures. Since circles don't have sides, what ratio(s) could you use to prove that all circles are similar?

Question

anonymous · Answer

Their radius/diameter and area/perimeter could work. Although the area and perimeter all rely on the radius which determines the size of all circles.

anonymous · Answer

ok the question makes very little sense

anonymous · Answer

I agree but i'm assuming that's what they are asking for since the size is really the only way to show them being similar, which is defined by the radius.

anonymous · Answer

ok thanks 

I owe you one

anonymous · Answer

No problem!