UVa 10347 - Medians

	/**
	* Author : Md.Mehadi Hasan Menon.
	* Problem : 10347 - Medians.
	* Status : Accepted.
	* Date : 07.11.2014.
	**/
	#include <stdio.h>
	#include <math.h>
	double areaOfTriangle(double a, double b, double c);
	int main()
	{
	double a, b, c, area;
	while(scanf("%lf %lf %lf", &a, &b, &c) != EOF)
	{
	if( a + b < c || b + c < a || c + a < b)
	printf("-1.000\n");
	else
	{
	area = areaOfTriangle(a, b, c);
	if(area <= 0)
	printf("-1.000\n");
	else
	printf("%.3lf\n", area);
	}
	}
	return 0;
	}
	double areaOfTriangle(double a, double b, double c)
	{
	double s, area;
	s = (a + b + c) / 2.0;
	area = (4.0/3.0) * sqrt(s * (s - a) * (s - b) * (s - c));
	return area;
	}

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