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.
(1/51*(51*(20^2+50.24)-0^2-28^2-13^2-21^2+3^2+31^2+16^2+18^2)-20.1176^2)
(1/51*(51*(20^2+50.24)-0^2-28^2-13^2-21^2+3^2+31^2+16^2+18^2)-20.1176^2)
Natural Language
Math Input
Extended Keyboard
