62.4 + 108.6 = 171
171*2=(170+1)*2=340+2=342
Perimeter = 342 feet
The perimeter of a figure is defined by length of its 2D shape.
For a rectangle it is the sum of the length of all its sides
P = a1 + a2 +b1 + b2
Since a rectangle has two sides with the same lengths as the other two
a1 = a2 ; b1 = b2
P = 2(a1 + b2)