c = circle() show(c) show(c) c1 = circle(r=100) show(c1) c2 = circle(r=70) show(c2) c1 = circle(x=-50, y=0, r=50) c2 = circle(x=50, y=0, r=50) show(c1,c2) show(c1,c2) c1 = circle(x=0, y=-50, r=50) c2 = circle(x=0, y=50, r=50) show(c1,c2)