We have: Area = Length × Width
Here, Area = 72 Ft²
Length = 9 Ft²
Substitute their values, in order to calculate the value of width:
72 = 9 × w
w = 72/9
w = 8 feet
Now, Perimeter of rectangle, = 2( l + b)
P = 2(9 + 8)
P = 2(17)
P = 34 Ft²
In short, your final answer would be 34 Ft²
Hope this helps!