The answer is 200 cm squared. You can find this out by know the diameter of the circle which is 20 cm and by the photo the square's corners touch the circle so if a line when through the square diagonally you would get 20cm. Now you know the hypotenuse you can find the side lengths. You can use the 45 45 90 triangle where both side lengths equal x and the hypotenuse equals x* the square root of 2, but instead you would divide 20 by the square root of 2 and you would get your side lengths and then just multiply them
