How did koreas location affect its cultural development

Let s = one side of the square
so s/4 = the shorter side of one of the rectangles while s = the longer side of a rectangle

10s/4 = the perimeter of one rectangle so
10s/4 = 25
       s = 10
4s = perimeter of the square
4(10) = 40 = perimeter of the square = your answer