So I'm confused. I saw this and initially thought it was just a matter of circumference. Suppose the radius of circle A is 10 and the radius of circle B is twice that amount, so it's 20

The formula to find the circumference of a circle is C = 2πr

So for circle A;

2π10 = 62.831

And for circle B;

2π20 = 125.663

Then to find the difference in circumferences, divide them

125.663/62.831 = 2.000

Therefore, it should take two rotations to rotate one circle around the other

What am I getting wrong here?