Code
c1= circle(x=0, y=0, r=20, stroke_width=1, stroke="red", fill="violet")
c2= circle(x=0, y=0, r=30, stroke_width=2, stroke="orange", fill="indigo")
c3= circle(x=0, y=0, r=45, stroke_width=3, stroke="yelow", fill="blue")
c4= circle(x=0, y=0, r=60, stroke_width=4, stroke="green", fill="green")
c5= circle(x=0, y=0, r=75, stroke_width=5, stroke="blue", fill="yelow")
c6= circle(x=0, y=0, r=90, stroke_width=6, stroke="indigo", fill="orange")
c7= circle(x=0, y=0, r=110, stroke_width=7, stroke="violet", fill="red")
show(c1, c2, c3, c4, c5, c6, c7)