Area and perimeter situations

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, start text, space, m, end text and $8\text{ m}$8, start text, space, m, end text long. He multiplies $7\times2$7, times, 2 and $8\times2$8, times, 2 and finds he needs $30\text{ m}$30, start text, space, m, end text of fencing.