Four friends are playing a game that involves hitting a small ball with a paddle to each other. The object of the game is to not let the ball hit the ground without moving from where they are standing. The four friends stand in a location, such that each person could represent a vertex of a square. The side length of the square that they form is 12 feet. What is the farthest distance, rounded to the nearest foot, that two of the friends could be from each other?