.
First, the unit to measure area is square foot, not foot.
Second, I am sure that "36feet and 2 inches" in the condition represent 36 square feet: 36 ft^2, which you mistakenly wrote in that form.
If it is so, then the equation is
4.5*L = 36,
where L is the length, and its solution is
the length = 
= 8 ft.
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Learn on how write your condition correctly.
It is IMPORTANT in Math.
It is important when you communicate on the Math subject.
It is important when you post to this forum.
Otherwise, nobody will understand you.
