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.
r^2+(x-r cos(α))^2+(y-r sin(α))^2 = x^2+y^2
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random