38.sagews

c=circle((0,0), 1, rgbcolor=(0,1,1))
c.show(axes=false)

u, v = var('u,v')
fx = u*v
fy = u
fz = v^2
P = parametric_plot3d([fx, fy, fz], (u, -1, 1), (v, -1, 1),frame=False, color="blue")
show(P)