A circle inscribed in a square has a diameter equal to the side of the square. With side 6 cm, the radius is 3 cm, and the area is pi * r^2 = 9 * pi cm^2.
The diameter of the circle inscribed in a square equals the side length of the square, making the radius 6 divided by 2, which is 3 cm. Using the area formula for a circle, pi times the square of the radius gives an area of 9 times pi square cm.