Since we know that length is twice the width, we can say that: Perimiter = 2(twice the width) + 2(width) Therefore, P = 2(2w) +2(w) this simplifies to P=6w Sine P=180, 160 = 6w, so w = 30 Because length is twice the width, length = 2 * width, or 2*30, which is 60