Exam Jan-2016 - 01. Triangle Area

/**
 * Project: Exam_101_January_2016 - created by borkins on 2017-05-03.
 */

import java.text.DecimalFormat;
import java.util.Scanner;

public class _01_TriangleArea
{
    public static void main(String[] args)
    {
        Scanner console = new Scanner(System.in);
        DecimalFormat df = new DecimalFormat("0.##");

        int x1 = Integer.parseInt(console.nextLine());
        int y1 = Integer.parseInt(console.nextLine());
        int x2 = Integer.parseInt(console.nextLine());
        int y2 = Integer.parseInt(console.nextLine());
        int x3 = Integer.parseInt(console.nextLine());
        int y3 = Integer.parseInt(console.nextLine());

        double base = Math.abs(x2 - x3);
        double height = Math.abs(y1 - y3);
        double area = base * height / 2;

        System.out.println(df.format(area));
    }
}