Poj Solution 2508

http://poj.org/problem?id=2508

//* @author:
import java.util.*;
public class Main {
 
static public void main( String [] str ){
   Scanner sc = new Scanner(System.in);
   double r, h, d1, a1, d2, a2, dg, l, s, a;

   while(sc.hasNext())
   {
      r=sc.nextDouble();
      h=sc.nextDouble();
      d1=sc.nextDouble();
      a1=sc.nextDouble();
      d2=sc.nextDouble();
      a2=sc.nextDouble();
      l = Math.sqrt( r*r + h*h );
      dg = 2*r*Math.PI / l;
      a = Math.abs(a1-a2);
      if( a > 180 ) a = 360 - a;
      a = a / 360 * dg;
      s = Math.sqrt( d1*d1 + d2*d2 - 2*d1*d2*Math.cos( a ) );
    System.out.printf( "%.2fn", s );
    }

   }
}