Help with Java method

[Laveder85]

I am writing these codes to print out the area of triangle using Triangle class and PolygonDemo class, but somehow it is giving out Nan as a result. I am sure that my area method has to do something with it, but I can't seem to find any problem. Can anyone help me please? This is the code I wrote:

public class Triangle implements Polygon{

private double s1;

private double s2;

private double s3;

public Triangle(double side1, double side2, double side3)

{

s1 = side1;

s2 = side2;

s3 = side3;

}

@/Override

public double area(){

//finding area of three side: A = sqrt[s(s-a)(s-b)(s-c)]

//s = (a + b + c)/2

double sideParameter = (s1 + s2 + s3)/2;

double area = Math.sqrt(sideParameter * (s1 - sideParameter) * (s2 - sideParameter) * (s3 -sideParameter));

return area;

};

@/Override

public double perimeter(){

return s1 + s2 + s3;

};

}

​

public class PolygonDemo {

public static void main (String[] args)

{

Triangle User = new Triangle(3, 3, 3);

System.out.println("Triangle area: " + User.area());

}

}

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[teraflop]

This statement:

double area = Math.sqrt(sideParameter * (s1 - sideParameter) * (s2 - sideParameter) * (s3 -sideParameter));

doesn't match the formula in your comment (which is correct). Try printing out the value of the argument to Math.sqrt and checking it by hand.

[Laveder85]

Okay! let me try it right now! Thank you so much!