Milo wants to put a fence around the dog park near his house. He measures the sides and finds they are 7\text{ m}7 m7, start text, space, m, end text and 8\text{ m}8 m8, start text, space, m, end text long. He multiplies 7\times27×27, times, 2 and 8\times28×28, times, 2 and finds he needs 30\text{ m}30 m30, start text, space, m, end text of fencing.
Which measurement does 30\text{ m}30 m30, start text, space, m, end text represent?