TriangleArea

package com.softuni;

import java.util.Scanner;

public class TriangleArea {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int x1 = Integer.parseInt(scanner.nextLine());
        int y1 = Integer.parseInt(scanner.nextLine());
        int x2 = Integer.parseInt(scanner.nextLine());
        int y2 = Integer.parseInt(scanner.nextLine());
        int x3 = Integer.parseInt(scanner.nextLine());
        int y3 = Integer.parseInt(scanner.nextLine());

        int a = Math.abs(x2-x3);
        int h = Math.abs(y2-y1);

        double s = (double)a * h /2;
        System.out.print(s);


    }
}