TriangleArea

package com.company;

import java.util.Scanner;

/**
 * Created by simonradev on 23-Dec-16.
 */
public class TriangleArea {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        int[][] coordinates = new int[3][2];

        int lenOfMatrice = coordinates.length;
        for (int i = 0; i < lenOfMatrice; i++) {

            String[] currCoordinates = scan.nextLine().toString().split(" ");

            for (int j = 0; j < 2; j++) {
                coordinates[i][j] = (Integer.parseInt(currCoordinates[j]));
            }
        }

        double areaOfTriangle = Math.round(calculateTheArea(coordinates));

        System.out.printf("%.0f", areaOfTriangle);
    }

    private static double calculateTheArea(int[][] coordinates) {

        double areaToReturn = Math.abs(coordinates[0][0]*(coordinates[1][1] - coordinates[2][1]) +
                              coordinates[1][0]*(coordinates[2][1] - coordinates[0][1]) +
                              coordinates[2][0]*(coordinates[0][1] - coordinates[1][1])) / 2.0;

        return areaToReturn;
    }
}