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.
pi*(integrate (1 - y^2/9) dy from y=1..3)
pi*(integrate (1 - y^2/9) dy from y=1..3)
Natural Language
Math Input
Extended Keyboard