The dimensions that maximize the area are 150ft × 300ft.
So, let y be the length of the side parallel to the river and x be the length of each of the two sides perpendicular to it.
The following provides the total fencing length:
The rectangular pen's surface area is:
We may determine the value of x required to maximize the area by determining the value of x for which the derivative of the area function is zero:
The value of y is: for x=150
Therefore, the dimensions that maximize the area are 150ft × 300ft.
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