Hey there!
We'll start with the outer circle.
Circumference is defined as 2πr, which is 2π times the radius. If the outer circle has a radius of 5, we plug in:
2π(5) = 10π
For the outer circle, we have a radius of 5 as well, therefore we also get:
2π(5) = 10π
For our total circumference, we get 20π
Hope this helps!
