Question 901284
L=w+8, and for enclosing the play area, p=2w+L, and you know a constant area A to be A=wL.



w=L-8 from given information.
{{{p=2w+L}}}.
{{{p=2(L-8)+L}}}
{{{p=2L-16+L}}}
{{{highlight(p=3L-16)}}}


{{{A=wL}}}
{{{A=(L-8)L}}}
{{{highlight(A=L^2-8L)}}}


When you know or given a value for area A, you can find L and use L to find p.