Answer: 159ft
Step-by-step explanation: So you are going to separate this figure. You will then have one rectangle and one square. You will now have different numbers. On the smaller figure it is 6*4ft. On the bigger figure it is 15*9ft.
6*4ft=24ft
15*9=135ft
So now you add them together.
135+24=159ft
I think that 159ft is the answer.