Question 1155358
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It is a classic problem on finding optimal dimension.


This problem was solved  MANY  TIMES  in this forum.


Therefore,  I created a lesson at this site,  explaining the solution in all details.


The lesson is under this link

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/A-farmer-planning-to-fence-a-rectangular-area-along-the-river--to-enclose-the-maximal-area.lesson>A farmer planning to fence a rectangular area along the river to enclose the maximal area</A>


Read this lesson attentively.

Consider it as your &nbsp;TEMPLATE.

Having this template in front of you, &nbsp;solve the &nbsp;GIVEN &nbsp;problem by the same way.


Having it written one time, &nbsp;I do not see any reasons to re-write it again and again with every new posted data set.


By the way, &nbsp;in the lesson, &nbsp;you will find many useful links to accompanied lessons.

Do not miss them.


Consider my lessons as your textbook, &nbsp;handbook, &nbsp;tutorial and &nbsp;(free of charge) &nbsp;home teacher.