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.
180°/pi*2*atan(h/(w*sqrt(n*n+1))) where h=1080, w=1920, n=7
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random