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if xy=18.5, then 2x+2y= diameter

if we assume x and y are equal, then

x^2=18.5, so

4x= diameter

so, we figure out the equation x^2=18.5...

x = sq. root of 18.5

x= 4.3

so the diameter would be 4 times 4.3, or 17.2 feet

if x does not equal y, then we would to know the relationship between x and y before we could solve the equation.

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Q: What is the diameter of an 18.5 square foot area?
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