02. TriangleArea

import java.util.Scanner;

public class _02_TriangleArea {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int aX = scan.nextInt();
        int aY = scan.nextInt();
        int bX = scan.nextInt();
        int bY = scan.nextInt();
        int cX = scan.nextInt();
        int cY = scan.nextInt();

        int triangleArea = Math.abs((aX * (bY - cY) + bX * (cY - aY) + cX * (aY - bY)) / 2);

        if (triangleArea != 0) {
            System.out.printf("The area of the triangle is: %d", triangleArea);
        }
    else {
            System.out.println("All points lie in a straight line and do not form a triangle");
            System.out.println("0");
        }
    }
}