1. The formula for calculate the perimeter of a rectangle, is:
P=2L+2W
P is the perimeter of the rectangle (P=320 feet). L is the lenght of the rectangle. W is the width of the rectangle. <span> 2. The problem says that the length of the rectangle is three times the width, so you have: </span> L=3W
3. When you substitute L=3W and P=320, into P=2L+2W, you obtain: