<PRE><B>Question 261985</B>
The perimeter formula is
(i) {{{P = 2L + 2W}}}
since one side is x, we get
(ii) {{{P = 2x + 2W}}}
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Now area = (1/2)LW = 12, but we have let L = x, so 
(iii) {{{xW = 24}}}
solving for W, we get
(iv) {{{W = 24/x}}}
By substitution of (iv) into (ii) , we get
(v) {{{P=2x + 48/x}}}</PRE>