立体

$kyokusen1 = ParametricPlot3D[{2 s, 2 t, s^2 + t^2}, {s, -2, 2}, {t, -2, 2}]$

$kyokusen2 = ParametricPlot3D[{2^(1/2) s + 2^(1/2) t, -2^(1/2) s + 2^(1/2) t, s^2 + t^2}, {s, -2, 2}, {t, -2, 2}]$

$kyokusen3 = ParametricPlot3D[{2 s, 2 t, -s^2 - t^2} + {0, 0, 15}, {s, -2, 2}, {t, -2, 2}]$

$kyokusen4 = ParametricPlot3D[{2^(1/2) s + 2^(1/2) t, -2^(1/2) s + 2^(1/2) t, -s^2 - t^2} + {0, 0, 15}, {s, -2, 2}, {t, -2, 2}]$

Created by Mathematica (November 5, 2010)

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