$5200 / $6.50/m = 800m of fence
maximum area for a given perimeter is a square, so we have an isosceles right triangle with both legs 400m long.
A farmer has $5200 to spend on fencing to make a pen along a river. A local company tells the farmer that they can build the pen for $6.50/m. The manager suggests a pen in the shape of a right triangle with the hypotenuse along the river. What are the dimensions.
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