The perimeter is 105.6 ft. The perimeter is the distance around the shape, which is the sum of all the sides. Since this is a square, all sides are equal, therefore since one side is 26.4, all is the sides are 26.4.
Add up all of the sides to get the perimeter.
26.4 + 26.4 + 26.4 + 26.4 = 105.6
