In a square of side 4, I pack 4 circles of unit radius.

What's the largest circle I can fit into the center (such that it doesn't overlap the other circles)?

(In reply to Tessellation by e.g.)

I assume that a unit square is referred to; if the 2x2 square shown in the picture is meant, then the solution is clearly wrong.

Posted by Federico Kereki on 2004-01-13 10:08:19