Code
c1 = circle(x=0, y=50, r=50)
c2 = circle(x=0, y=-50, r=50)
c3 = circle(x=50, y=0, r=50)
c4 = circle(x=-50, y=0, r=50)
show(c1, c2, c3, c4)
c2 = circle(x=0, y=50, r=50)
c3 = circle(x=0, y=75, r=75)
show(c2, c3)
c2 = circle(x=0, y=-50, r=50)
c3 = circle(x=0, y=-75, r=75)
show(c2, c3)
c2 = circle(x=50, y=0, r=50)
c3 = circle(x=75, y=0, r=75)
show(c2, c3)
c2 = circle(x=-50, y=0, r=50)
c3 = circle(x=-75, y=0, r=75)
show(c2, c3)
c1 = circle(x=0, y=50, r=50,fill="yellow",stroke="none")
show(c1)
c2 = circle(x=0, y=-50, r=50,fill="yellow",stroke="none")
c3 = circle(x=50, y=0, r=50,fill="red",stroke="none")
c4 = circle(x=-50, y=0, r=50,fill="red",stroke="none")
show(c2, c3, c4)