Answer:
1011.66
Step-by-step explanation:
3.14 (20)^2-3.14 (9)^2
3.14(400-81)
3.14 (319)
Shaded region = Area of large circle - Area of small circle
Area of circle =
[tex]\pi {r}^{2} [/tex]
R of large circle = 11 + 9 = 20 ft
r of small circle = 11 ft
.....
