circle(r=50, fill="red", stroke="none") c1 = circle(r=150, fill="green", stroke="none") c2 = circle(r=130, fill="blue", stroke="none") c3 = circle(r=110, fill="yellow", stroke="none") c4= circle(r=60, fill="black", stroke="none") show(c1, c2, c3, c4)