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.
sqrt(11^2+7^2-2*11*7*cos(51))
sqrt(11^2+7^2-2*11*7*cos(51))
Natural Language
Math Input
Extended Keyboard
