10 loop: 1pi

9 Ring radius: 2

9 Ring area: (2 2-12) pi = 3pi

1 ring radius: 10

1 area of the ring: (10 2-9 2) pi = 19pi.

Therefore, the area of the 10 ring is 119 of the ring.

9 The area of a ring is 1 319 of the ring.