Draw the largest circle in a square. If the area of the circle is 15.7 square centimeters, then the area of the square is () square centimeters? My sixth grade, do not list difficult formula, as long as the ordinary formula, thank you!

Draw the largest circle in a square. If the area of the circle is 15.7 square centimeters, then the area of the square is () square centimeters? My sixth grade, do not list difficult formula, as long as the ordinary formula, thank you!

Radius ^ 2 = 15.7 / 3.14 = 5
Square area = 4 * radius ^ 2 = 485 = 20 square centimeters