Answer:
The horse can graze an area (3/4)π(52) = 75π/4 ≈ 58.905 square feet.
If the rope has L = 25 feet, then the horse can graze the area of 3/4 of a circle with radius 25. But along the 10 foot wall, there is also 15 feet of rope left over. The horse can then graze an extra 1/4 circle with a radius of 15 feet. Similarly, along the 20 foot wall, the horse can also graze an extra 1/4 circle with a radius of 5 feet.
Step-by-step explanation:
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