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Calculating the amount of fencing required

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A farmer plans to fence a rectangular pasture adjacent to a river. The pasture must contain 180,000 square meters. What dimensions would require the least amount of fencing if no fencing is needed along the river?

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The solution provides detailed explanations and calculations for the problem.

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The fencing length required is f=w+2l
where l is the length
w is the width and length of the river ...

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