The applet will show you the surfaces obtained by revolving a section of a function around an axis of rotation.[br][list][br][*] Type a function of [math]x[/math] into the input box: [math]y = f(x)[/math]. (no implicit functions and no [math]x(y)[/math].)[br][*] Move points C and D to choose an axis of rotation.[br][*] Move points A and B to select a segment of your function for rotation.[br][*] Either drag the angle slider by hand to revolve your function segment around your axis or click the triangle to revolve automatically.[br][/list]