Cut a square with a side length of 10 cm into the largest circle. What is the area of the circle? Its area is about a fraction of that of the square

Cut a square with a side length of 10 cm into the largest circle. What is the area of the circle? Its area is about a fraction of that of the square

1. The square area is 10 * 10 = 100 square centimeters;
2. The largest circle is 10 cm in diameter, 5 cm in radius and 3.14 * 5 in area