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-9=sqrt(9^2+22^2-(a-9)^2), R=a+13
R-9=sqrt(9^2+22^2-(a-9)^2), R=a+13
Natural Language
Math Input
Extended Keyboard
