what is s in the area of a triangle code example

Example 1: area of triangle

import java.util.Scanner;

public class shw2point15 {

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

        System.out.println("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 s = ((x1 + y1) + (x2 + y2) + (x3 + y3)) / 2;
        double area = Math.sqrt(s * (s - (x1 - y1)) * (s - (x2 - y2)) * (s - (x3 - y3)));



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

Example 2: what is the formula to find the area of a triangle

A=hbb
2=5·5
2=12.5

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C Example