Code
fill=color(r=255, g=0, b=0)
c1 = circle(x=-50, y=0, r=50, fill=fill)
c2 = circle(x=50, y=0, r=50, fill=fill)
show(c1, c2)
c3=circle(x=0, y=-50, r=50, fill=fill, stroke="none")
c4=circle(x=0, y=50, r=50, fill=fill, stroke="none")
show(c3, c4)
fill=color(r=0, g=255, b=0, a=.5)
c5=circle (x=50, y=50, r=50, fill=fill, stroke="none")
c6=circle (x=-50, y=50, r=50, fill=fill, stroke="none")
c7=circle (x=50, y=-50, r=50, fill=fill, stroke="none")
c8=circle (x=-50, y=-50, r=50, fill=fill, stroke="none")
fill=color(r=250, g=0, b=2, a=.5)
c9=circle (r=143, fill=fill)
show(c5, c6, c7, c8, c9)
k=color(r=49, g=9, b=100, a=.4)
r1=rectangle (w=100, b=100,fill=k, stroke="none")
j=color(r=0, g=200, b=255, a=.2)
r2=rectangle (h=200, b=150, fill=j, stroke="none")
show(r1, r2)
