The lateral surface area of a cube is 420 cm 2 ^2 2 less than the lateral surface area of a cylinder. The height of the cylinder is 2 x 2x 2 x cm, and...

The lateral surface area of a cube is 420 cm$^2$ less than the lateral surface area of a cylinder. The height of the cylinder is $2x$ cm, and the radius of the cylinder is $x$ cm. The side of the cube is equal to the radius of the cylinder. Find the approximate area of a circle with radius $x + 3$ cm.