Please tell me why I wrong?

import java.util.*;
import java.math.*;
public class Program {
 public static void main (String arqs[]) {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt(),b = sc.nextInt();

    double x = (a+Math.sqrt(a*a+2*b*b))/2;
    double S = (a+x)/2*Math.sqrt(b*b-(x-a)*(x-a));
    System.out.printf("%.9f",S);
       }
   }



Edited by author 02.01.2012 04:44

Hi,
Can you please tell me how did you find this formula ?
I have tried many times, but cannot find the solution.
Thanks.

Oh, all is very easy. Using derivative, you can find angle between sticks in which area has a maximum value. Just find stationary point of area function.



Edited by author 12.02.2012 17:45

Thank you very much.