[list][br][*] To graph a particular solid of revolution (around the x-axis), enter an equation [math]f(x) = ...[/math] in the input bar. [br][*] The surface may be rotated using a mouse -- right-click and drag. [br][*] The green slider controls the green curve, which shows how the surface is generated, by rotating the curve around the x-axis.[br][*] The purple slides controls the purple curve, which shows the circular cross-sections along the length of the surface.[br][/list][br][br]Created by Lee Stemkoski, [url]http://www.geogebratube.org/user/profile/id/549[/url]