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*sqrt(r^2 + (300/(pi*r^2))^2) + 1/2*pi*r/(sqrt(r^2 + (300/(pi*r^2))^2))*(2r + 600/(pi*r^2))*(-600/(pi*r^3)) = 0
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random