Answer :
To calculate the perimeter we have to add all the sides of the polygon:
[tex]P=5+5+19+28+5+5+9+(28-5-5)=94[/tex]There is one side that does note have a explicit length, but we can calculate its length because it is equal to the largest side (28 ft) less two sides of length 5 ft.
The perimeter of the pool is 94 ft.