This is from project 4.1 from \"Big Java.\" In this project, you perform calcula

Question

This is from project 4.1 from "Big Java."

In this project, you perform calculations with triangles. A triangle is defined by the x- and y-coordinates of its three corner points. Your job is to compute the following properties of a given triangle:

-the lengths of all sides
-the perimeter
-the angles at all corners
-the area

Of course you should implement a Triangle class with appropriate methods. Supply a program that prompts a user for the corner point coordinates and produces a nicely formatted table of the triangle properties.

Please help I am having major trouble doing this question

Explanation / Answer

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import java.util.*;
public class triangle
{public static void main(String [] args)
     {double x1,x2,x3,y1,y2,y3,s1,s2,s3,p,a1,a2,a3,a,f=180./3.14;
    Scanner in = new Scanner(System.in);
     System.out.println("enter point 1 of triangle");
     System.out.print("enter x: ");
    x1=in.nextDouble();
    System.out.print("enter y: ");
    y1=in.nextDouble();
     System.out.println("enter point 2 of triangle");
     System.out.print("enter x: ");
    x2=in.nextDouble();
    System.out.print("enter y: ");
    y2=in.nextDouble();
     System.out.print("enter point 3 of triangle");
     System.out.print("enter x: ");
    x3=in.nextDouble();
    System.out.print("enter y: ");
    y3=in.nextDouble();
    s1=getside(x1,y1,x2,y2);
    s2=getside(x1,y1,x3,y3);
    s3=getside(x3,y3,x2,y2);
    a=area(s1,s2,s3);
    p=perimeter(s1,s2,s3);
    a1=Math.acos(((s1*s1+s2*s2-s3*s3)/(2*s1*s2)))*f;//1 angle
     a2=Math.acos(((s3*s3+s2*s2-s1*s1)/(2*s3*s2)))*f; // angle 2
     a3=Math.acos(((s1*s1+s3*s3-s2*s2)/(2*s1*s3)))*f; //angle 3
    System.out.println("Your Triangle");
    System.out.println("points:   ("+x1+","+y1+"),("+x2+","+y2+"),("+x3+","+y3+")");
    System.out.println("sides:     "+s1+"          "+s2+"          "+s3);
    System.out.println("angles:    "+a1+"          "+a2+"          "+a3);
    System.out.println("area:      "+a);
    System.out.println("perimeter: "+p);
    }
public static double area(double side1, double side2, double side3)
{double s;
s=(side1+side2+side3)/2;
return Math.sqrt(s*(s-side1)*(s-side2)*(s-side3));
}
public static double perimeter(double side1, double side2, double side3)
{return side1+side2+side3;
}
public static double getside(double x1, double y1, double x2, double y2)
{return Math.sqrt(Math.pow(Math.abs(x1-x2),2)+Math.pow(Math.abs(y1-y2),2));
}

}

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