understand I shoot 4 times whorse then I thought I did
Nah... you don't. Despite the fact that the group is two dimensional, we still tend to measure them c to c in a straight line between the two shots furthest apart. So our measurement of a group at 100 yards will be only double what it may have been at 50, even though the group as a whole covers more than double the area. The area thing is just a curiosity. Numbers.