Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
rotate the region between (1/4)x^2 and 0 with 0<x<2 around the y-axis
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
