TriangleArea

package syntax;

import java.util.Scanner;

public class TriangleArea {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		int aX = input.nextInt();
		int aY = input.nextInt();
		int bX = input.nextInt();
		int bY = input.nextInt();
		int cX = input.nextInt();
		int cY = input.nextInt();
		input.close();
		double a = Math.sqrt((cX - bX)*(cX - bX) + (cY - bY)*(cY - bY));
		double b = Math.sqrt((aX - bX)*(aX - bX) + (aY - bY)*(aY - bY));
		double c = Math.sqrt((cX - aX)*(cX - aX) + (cY - aY)*(cY - aY));
		if ((a + b == c) && (b + c == a) && (c + a == b)) {
			System.out.println(0);
		} else {
			int area = Math.abs((aX * (bY - cY) + bX * (cY - aY) + cX * (aY - bY)) / 2);
			System.out.println(area);
		}
	}
}