The difference between the size of two squares is 40 square centimeters, the sum of the sides of two squares is 20 centimeters, and the area of a small square

The difference between the size of two squares is 40 square centimeters, the sum of the sides of two squares is 20 centimeters, and the area of a small square

Large small = 40
Long + short = 20,
Length short = 2, the side length of the small square is 9, and the area is 81 square centimeters