Or you can drop your square, drop the circle inside, empty the lot and then add vertices equi-distant around the square edges to connect to your circle. Select all and fill. Then add thickness, select all again and crease all greater than 50 degrees.

Or... drop a cube, drop a cylinder inside it (change x & y scale to suit. Select all, Ctrl+Alt click a vertice on the cube, then do a Boolean subtraction.

Message edited on: 11/08/2004 16:34