circle();
translate([0,3,0]) circle(1, true);
translate([5,1,0]) circle(r=3, center=true);
translate([0,-1,0]) circle(r=0, center=true);
translate([0,-3,0]) circle(1, true, $fn=4);
translate([3,-3,0]) circle(1, true, $fn=8);
translate([6,-3,0]) circle(1, true, $fn=12);
translate([0,-6,0]) circle(1, true, $fa=20, $fs=0.3);
translate([3,-6,0]) circle(1, true, $fa=30, $fs=0.3);
translate([6,-6,0]) circle(1, true, $fa=40, $fs=0.3);