It would seem to me that if you can find the height of the tetrahedron that is formed by the centers of all the cannonballs, then the rest is easy. The formula for the height of a tetrahedron is h = 1/3 6 x, where x is the side of the tetrahedron. X would be the same as d in this case. So because there are 3 rows of cannonballs (6 on the bottom, 3 in the middle and 1 on top) you would have to multiply the height by 2 then add one diameter. So 2h + d.

Posted by Danny
on 20040803 18:17:28 