Area of a ring: a circle inside a circle

Subtract the area of the small circle from the area of the large circle. Use π = 3.14.

1. A circular pond with a radius of 13 m sits inside a circular lawn with a radius of 17 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
2. A circular pond with a radius of 3 m sits inside a circular lawn with a radius of 12 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
3. A circular pond with a radius of 11 m sits inside a circular lawn with a radius of 14 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
4. A circular pond with a radius of 3 m sits inside a circular lawn with a radius of 8 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
5. A circular pond with a radius of 10 m sits inside a circular lawn with a radius of 12 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
6. A circular pond with a radius of 2 m sits inside a circular lawn with a radius of 4 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
7. A circular pond with a radius of 5 m sits inside a circular lawn with a radius of 24 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
8. A circular pond with a radius of 1 m sits inside a circular lawn with a radius of 7 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
9. A circular pond with a radius of 15 m sits inside a circular lawn with a radius of 18 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
10. A circular pond with a radius of 2 m sits inside a circular lawn with a radius of 11 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
11. A circular pond with a radius of 4 m sits inside a circular lawn with a radius of 5 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
12. A circular pond with a radius of 3 m sits inside a circular lawn with a radius of 9 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
13. A circular pond with a radius of 14 m sits inside a circular lawn with a radius of 18 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
14. A circular pond with a radius of 21 m sits inside a circular lawn with a radius of 23 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
15. A circular pond with a radius of 32 m sits inside a circular lawn with a radius of 38 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
16. A circular pond with a radius of 2 m sits inside a circular lawn with a radius of 13 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
17. A circular pond with a radius of 43 m sits inside a circular lawn with a radius of 45 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
18. A circular pond with a radius of 2 m sits inside a circular lawn with a radius of 12 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
19. A circular pond with a radius of 6 m sits inside a circular lawn with a radius of 32 m. What is the area of the grass around the pond, in m²? Use π = 3.14.
20. A circular pond with a radius of 11 m sits inside a circular lawn with a radius of 17 m. What is the area of the grass around the pond, in m²? Use π = 3.14.