Program to calculate area of Enneagon

Enneagon is a polygon with 9 sides and 9 internal angles. Enneagon is also known as Nonagon. A regular nonagon has an internal angle of 140 degrees each. Sum of interior angles of the nonagon is 1260 degree.
The center of the circumcircle is also taken as the center of the regular Nonagon.
The line segment drawn the perpendicular to a side of the Nonagon is called the Apothem and is represented by ‘a’. Area &approx; 6.1818 * s * s
where s is side length.

Examples:

Input : 6
Output :Area of Regular Nonagon = 222.5448

Input : 8
Output :Area of Regular Nonagon = 395.6352

C++

 // CPP program to find area of a Enneagon #include #include #include using namespace std;    // Function to calculate area of nonagon double Nonagon_Area(double s) {    return (6.1818 * s * s);  }    // driver function int main() {   double s = 6; // Length of a side   cout << "Area of Regular Nonagon = " << std::setprecision(7)        << Nonagon_Area(s);   return 0; }

Java

 // Java program to find area of a Enneagon class Nonagon {      // Function for calculating the area of the nonagon   public static double Nonagon_Area(double s) {      return ((6.1818 * (s * s)));    }      // driver code   public static void main(String[] args) {     double s = 6; // Length of a side     System.out.print("Area of Regular Nonagon = " + Nonagon_Area(s));   } }

Python

 # python program to find area of a Enneagon length = 6 Nonagon_area = 6.1818 * (length ** 2)  print("Area of regular Nonagon is = ", Nonagon_area)

C#

 // C# program to find area of a Hexagon using System;    class Nonagon {        // Function for calculating      // the area of the nonagon     public static double Nonagon_Area(double s)     {         return ((6.1818 * (s * s)));     }        // driver code     public static void Main()     {            // Length of a side         double s = 6;          Console.WriteLine("Area of Regular Nonagon = " +                                        Nonagon_Area(s));     } }    // This article is contributed by vt_m

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PHP



Output:

Area of Regular Nonagon = 222.5448