Java Program to Find Area of Enneagon

class Main
{
    public static void main(String [] args)
    {
        //side length of enneagon declared
        int a = 1;
        //finding area using formula 
        double ar = 6.1818 * a * a;
        System.out.println("The area of enneagon is: " + ar);
    }
}

Output:

The area of enneagon is: 6.1818