Prob2_TriangleArea

import java.util.Scanner;

public class Prob2_TriangleArea {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        int[][] points = new int[3][2];
        int[] positions = new int[]{0,1,2,0,1};
        for (int i = 0; i < 3; i++) {
            System.out.print("Enter the coordinates of the " + (i+1) + " point: ");
            points[i][0] = input.nextInt();
            points[i][1] = input.nextInt();
            System.out.println();
        }

        float sum =0f;
        for (int i = 0; i < points.length; i++) {
            sum = sum + points[positions[i]][0] * (points[positions[i+1]][1]-points[positions[i+2]][1]);
        }

        float area = Math.abs(sum/2);
        System.out.printf("The area of the triangle is: %.2f", area);
    }

}