alexisacosta12oytdlj alexisacosta12oytdlj 03-11-2017 Mathematics contestada Mr. Brown just fenced in an area for his dog. He used exactly 40 feet of fencing for the rectangular shaped enclosure. If the length of the enclosure is 14 feet, what is its width? The formula for the perimeter of a rectangle is P = 2l + 2w.