Question 478963
The new dimemsion will be x + 5.
This squared will equal the original (x)*2 + 245 ft.

(x + 5)^2  = x^2  + 245 ft.
x^2 + 10x + 25 = x^2  + 245

10X =  220
x = 22.

So,  27^2 = 22^2 + 245
729 ft  = 484 ft  + 245 ft.
The original side length was 22 ft, the original area was 484 ft.
Cleomenius.