c1 = circle(r = 100,fill = "blue", stroke= "blue") c2 = circle(r = 70,fill = "yellow",stroke= "yellow") c3 = circle(r = 50,fill = "red",stroke="red") z1 = rectangle(w = 50,h = 50,fill= "green", stroke= "green") show(c1,c2,c3,z1)