A cannonball is fired at a circular target with a radius of 20 m. If the bullets are assumed to hit a circle and the chances of hitting all points on the circle are considered the same, then the chances of the bullet hitting the target are:
3.1. At a distance of 4 m from the center of the circle is
3.2. At a distance of 4 m from the circumference of the circle is
3.3. The area of a rectangle with a distance of 2 m each from the center of the circle to the west and east, and each 3 m from the center of the circle to the north and south is:
3.4. At a distance of 2 m from the center of the circle, at least 2 times if the cannonball is fired 10 times are:
complete exact solution please, not just from excel