Answer:
Step-by-step explanation:
- Area of circle: A = πr²
- foot to inch: 1 ft = 12 in
Given radius of concentric circles:
- 0.5 ft = 6 in
- 1 ft = 12 in
- 1.5 ft = 18 in
The shaded area:
- Area of big circle - area of middle circle + area of small circle
- π(18²) - π(12²) + π(6²) ≈ 678 in²
Correct choice is C
