User Portlet User Portlet

Discussions
Thanks, I was trying to find the surface area of a cone ![enter image description here][1] through double integration and the radius of the cone is 28.25. So would the above be correct. Sorry I am only in high school so not really sure about some of...
I know i am supposed to use RevolutionPlot3D but not sure how to rotate the above function around the y-axis