Points Inside The House (Homework)

import java.util.Scanner;

public class Problem9_PointsInsideTheHouse {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        double pointX = input.nextDouble();
        double pointY = input.nextDouble();
        double triangleCx = 12.5;
        double triangleCy = 8.5;
        double triangleAx = 17.5;
        double triangleAy = 3.5;
        double triangleBx = 22.5;
        double triangleBy = 8.5;
        if(isInside(triangleAx,triangleAy,triangleBx,triangleBy,triangleCx,triangleCy,pointX,pointY)){
            System.out.println("Inside");
        }
        else if (pointX >= 12.5 && pointX <= 17.5 && pointY <= 13.5 && pointY >=8.5){
            System.out.println("Inside");
        }
        else if (pointX >= 20 && pointX <= 22.5 && pointY <= 13.5 && pointY >=8.5){
            System.out.println("Inside");
        }
        else{
            System.out.println("Outside");
        }
    }
    static boolean isInside(double x1, double y1, double x2, double y2, double x3, double y3, double x, double y)
    {
       double A = area (x1, y1, x2, y2, x3, y3);

       double A1 = area (x, y, x2, y2, x3, y3);

       double A2 = area (x1, y1, x, y, x3, y3);

       double A3 = area (x1, y1, x2, y2, x, y);

       return (A == A1 + A2 + A3);
    }
    static double area(double x1, double y1, double x2, double y2, double x3, double y3)
    {
       return Math.abs((x1*(y2-y3) + x2*(y3-y1)+ x3*(y1-y2))/2.0);
    }
}