g4 = Plot3D[x^(1/2), {x, 0, 2}, {y, -1, 1}]

[Graphics:HTMLFiles/kn5e02s_2.gif]

- SurfaceGraphics -

p4 = ParametricPlot3D[{Cos[u]/2 + 1/2, Sin[u]/2, t}, {u, 0, 2Pi}, {t, 0, 1}]

[Graphics:HTMLFiles/kn5e02s_5.gif]

- Graphics3D -

Show[g4, p4]

[Graphics:HTMLFiles/kn5e02s_8.gif]

- Graphics3D -