var('u v')
(u, v) (u, v) |
parametric_plot3d([u * cos(v), u * sin(v), sqrt(9 - u^2)], (u, 0, 3), (v, 0, 2 * pi))
colors = ("red", "orange", "green", "blue")
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sum([ parametric_plot([a * cos(v), a * sin(v)], 0, 2 * pi, rgbcolor = colors[a]) for a in range(4) ])
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sum([ parametric_plot3d([a * cos(u) * sin(v), a * sin(u) * sin(v), a * cos(v)], (u, 0, 2 * pi), (v, 0, pi), color = colors[a], opacity = 0.1) for a in range(4) ])
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