This applet explores the surface of revolution obtained by rotating a curve about any axes in 3D.[br][list][*]Enter the parametric equation of the curve [b][i]x= f(t)[/i][/b] and [i][b]y=g(t[/b][/i]), enter also an interval for [i][b]t[/b][/i].[br][/*][*]Drag the sliders for the polar angle [i][b]θ[/b][/i], and the angle [i][b]φ[/b][/i] between the z-axis and the axis of rotation (the yellow line) to select different positions for that axis.[br][/*][*]See the special cases for the axis of rotation: in any of the coordinate planes and on the coordinate axes.[/*][/list]