The circumference of a rectangular piece of paper is 160cm, and the ratio of length to width is 5:3. If it is cut into the largest square piece of paper, what is the area of the square piece of paper?

The circumference of a rectangular piece of paper is 160cm, and the ratio of length to width is 5:3. If it is cut into the largest square piece of paper, what is the area of the square piece of paper?

(160 △ 2 × 35 + 3) 2, = (80 × 38) 2, = 900 (square centimeter); answer: the area of a square is 900 square centimeter