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.
h=R(1-sqrt(1+cos(2*arcsin(1-sqrt(c/(2*R))))/2));R=6371,c=50
h=R(1-sqrt(1+cos(2*arcsin(1-sqrt(c/(2*R))))/2));R=6371,c=50
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
