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Sagot :
Answer:
14400 [yards²].
Step-by-step explanation:
all the details are in the attached picture; answer is marked with orange colour.
note, the suggested way of solution is not the shortest one, modify the design according Your local requirements.
P.S. ∡ means 'if', ⇒ means 'then'.

Answer:
- 14400 yd²
Step-by-step explanation:
Fencing is the perimeter of rectangle:
- P = 2(l + w) = 480
The sum of dimensions is:
- l + w = 240 yd
The area is the product of two dimensions:
- A = lw
- A = l(240 - l) = 240l - l²
This a quadratic relationship and the maximum value is obtained at vertex.
The vertex is the point:
- l = -b/2a = -240/ -2 = 120
It means both l and w have same length of 120 yd
The area is:
- A = 120*120 = 14400 yd²
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