Answer:
 1520.5 ft²
Step-by-step explanation:
A diagram can be helpful.
The total area is the sum of ...
 3/4 of a circle with radius 24 ft
 1/4 of a circle with radius 12 ft
 1/4 of a circle with radius 8 feet
__
The area of a whole circle is given by ...
 A = πr²
so our grazing area is ...
 A = (3/4)π(24 ft)² + (1/4)π(12 ft)² + (1/4)π(8 ft)²
 = π(432 ft² +36 ft² +16 ft²) = 484π ft²
 A ≈ 1520.5 ft²
