This is not a HW but someone said in a previous thread that it sounds like it so I will post it here because it fits the format I guess. 1. The problem statement, all variables and given/known data I have a flat plat that is x by y. It has an unknown number of holes in it but I do know the diameter of the holes is D. I also know that s/D = 4 where s is the spacing between holes of diameter D. Using this how can I estimate the total area absent in the flat plat, i.e. the amount missing. 2. Relevant equations s/D = 4 area rectangle = x*y area circle = pi*r^2 D = 0.05" x = 4 y = 3 3. The attempt at a solution I've been over thinking this but I can maybe estimate the amount of circles of diameter D can possible fit in there and leave it at that but is there a mathematical way to do this as oppose to me just drawing it out and guessing the amount of holes.