There are infinitely many posible answers. The sides will not be of integer length in the units used.
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That depends on the dimensions !... A 1 x 18 rectangle has a perimeter of 38 ! A 2 x 9 rectangle has a perimeter of 22 ! A 3 x 6 rectangle has a perimeter of 18 !
21 x 2 has greatest perimeter
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If they are the dimensions of a rectangle then the perimeter is: 2*(26+16) = 84
There is no limit to the size of the perimeter.