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| There seems to be an easier answer. ParametricPlot3D[{Cos[u], Sin[u], t}, {u, 0, 2 Pi}, {t,0,5}] (*has radius of 1*} ParametricPlot3D[{2*Cos[u], 2*Sin[u], t}, {u, 0, 2 Pi}, {t,0,5}] (*has radius of 2*} It shouldn't be to hard (I think)... |