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Area 39*1=39

perimeter 39+39+1+1=80

* * * * *

Wrong!

What about 0.1 * 390 which has an area of 0.1*390 = 39, as required but a perimeter of 0.0 + 0.1 + 390 + 390 = 780.2

Or 0.01 * 3900 with a perimeter of 7800.02

or 0.001 * 39000 with a perimeter of 78000.002

In fact, unless the question specifies that the sides MUST have integer measures, there is no limit. And the question does not make that requirement.

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Q: What is the greatest perimeter of a rectangle with an area of 39 square feet?
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