Java Arithmetic Operator calculate area of a triangle

Question

We would like to calculate area of a triangle.

Prompt the user to enter three points (x1, y1), (x2, y2), (x3,y3) of a triangle,

Display its area.

The formula for computing the area of a triangle is 

s  =  (side1  + side2  +  side3)/2; 
area  =  2s(s  -  side1)(s  -  side2)(s  -  side3) 

import java.util.Scanner;

public class Main {

  public static void main(String[] Strings) {

    Scanner input = new Scanner(System.in);
    System.out.print("Enter three points for a triangle: ");

    // triangle points
    double x1 = input.nextDouble();
    double y1 = input.nextDouble();
    double x2 = input.nextDouble();
    double y2 = input.nextDouble();
    double x3 = input.nextDouble();
    double y3 = input.nextDouble();

    //your code//w  ww . j av a2  s  . c o m

    System.out.println("The area of the triangle is " + area);
  }
}



import java.util.Scanner;

public class Main {

  public static void main(String[] Strings) {

    Scanner input = new Scanner(System.in);
    System.out.print("Enter three points for a triangle: ");

    // triangle points
    double x1 = input.nextDouble();
    double y1 = input.nextDouble();
    double x2 = input.nextDouble();
    double y2 = input.nextDouble();
    double x3 = input.nextDouble();
    double y3 = input.nextDouble();

    // gettings sides of triangle
    double side1 = Math.pow((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2), 0.5);
    double side2 = Math.pow((x1 - x3) * (x1 - x3) + (y1 - y3) * (y1 - y3), 0.5);
    double side3 = Math.pow((x3 - x2) * (x3 - x2) + (y3 - y2) * (y3 - y2), 0.5);

    double s = (side1 + side2 + side3) / 2.0;
    double area = Math.pow(s * (s - side1) * (s - side2) * (s - side3), 0.5);

    System.out.println("The area of the triangle is " + area);
  }
}

Use method 


import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.print("Enter three points for a triangle: ");
    double x1 = input.nextDouble();
    double y1 = input.nextDouble();
    double x2 = input.nextDouble();
    double y2 = input.nextDouble();
    double x3 = input.nextDouble();
    double y3 = input.nextDouble();

    double area = areaOfTriangle(x1, y1, x2, y2, x3, y3);

    System.out.println("The area of the triangle is " + area);
  }//w ww.  j a v a 2  s . c  o m

  private static double areaOfTriangle(double x1, double y1, double x2,
    double y2, double x3, double y3) {
    double s1 = distance(x1, y1, x2, y2);
    double s2 = distance(x2, y2, x3, y3);
    double s3 = distance(x3, y3, x1, y1);
    double s = (s1 + s2 + s3) / 2.0;
    return Math.sqrt(s * (s - s1) * (s - s2) * (s - s3));
  }

  private static double distance(double x1, double y1, double x2, double y2) {
    return Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
  }
}



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