Respuesta :

19,3/4 = 79/4
15,3/4 = 63/4
Perimeter = 79/4+79/4+63/4+63/4 = 284/4 = 71feet

22,1/2 = 45/2 X 4 = 90
90-71= 19 feet 

Let me know if you need more of an explanation, but the answer in 19 feet (option 4)