(((62.5^2-(115cos(20)/2)^2)^(1/2))+((62.5^2-(115cos(20)/2)^2)^(1/2))-121*sin(20))/(pi*5*cos(20))

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.