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Given any number b > 2, let l = 2b/(b-2)

then the rectangle with sides of l and b will have an area

= l*b = 2b/(b-2) * b = 2b2/(b-2)

and perimeter = 2*(l+b) = 2*[2b/(b-2) + b]

=2*[2b/(b-2) + b(b-2)/(b-2)] = 2/(b-2)* [2b+b2-2b] = 2b2/(b-2)

So that the area and perimeter have the same numeric value.

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Q: What are the rectangles with an area the same as perimeter?
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