Program to calculate Area Of Octagon

A regular octagon is a closed figure with sides of the same length and internal angles of the same size. It has eight lines of reflective symmetry and rotational symmetry of order 8. The internal angle at each vertex of a regular octagon is 135°. The central angle is 45°.

Properties :

Convex polygon, Equilateral polygon, Isogonal figure, Isotoxal figure, Cyclic.

Formula :

Area : 2 × (side length)² × (1+sqrt(2))

Examples :

Input : side = 3
Output : Area of Regular Octagon = 43.4558

Input : side = 4
Output : Area of Regular Octagon = 77.2548



C++

filter_none

edit
close

play_arrow

link
brightness_4
code

// CPP program to find area of octagon
#include <bits/stdc++.h>
using namespace std;
  
// Utility function
double areaOctagon(double side)
{
    return (float)(2 * (1 + sqrt(2)) * 
                   side * side);
}
  
// Driver Code
int main()
{
    double side = 4;
    cout << "Area of Regular Octagon = "
         << areaOctagon(side) << endl;
    return 0;
}

chevron_right


Java

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program to find 
// area of Octagon.
import java.io.*;
  
class GFG
{   
    // utility function
    static double areaOctagon(double side)
    {
    return (float)(2 * (1 + Math.sqrt(2)) 
                          * side * side);
    }
      
    // driver code
    public static void main(String arg[])
    {
        double side = 4;
        System.out.print("Area of Regular Octagon = "  
                          + areaOctagon(side));
    }
}
  
// This code is contributed by Anant Agarwal.

chevron_right


Python3

filter_none

edit
close

play_arrow

link
brightness_4
code

# Python3 program to 
# find area of octagon
  
import math
  
# Utility function
def areaOctagon(side):
    return (2 * (1 + (math.sqrt(2))) * side * side)
  
# Driver function
side = 4
print("Area of Regular Octagon =",
       round(areaOctagon(side), 4))
  
# This code is contributed
# by Azkia Anam.

chevron_right


C#

filter_none

edit
close

play_arrow

link
brightness_4
code

// C# Program to find 
// area of Octagon.
using System;
  
class GFG
    // utility function
    static double areaOctagon(double side)
    {
    return (float)(2 * (1 + Math.Sqrt(2)) 
                        * side * side);
    }
      
    // Driver code
    public static void Main()
    {
        double side = 4;
        Console.WriteLine("Area of Regular Octagon = "
                          + areaOctagon(side));
    }
}
  
// This code is contributed by vt_m.

chevron_right


PHP

filter_none

edit
close

play_arrow

link
brightness_4
code

<?php
// PHP program to find area of octagon
  
// Utility function
function areaOctagon( $side)
{
    return (2 * (1 + sqrt(2)) * 
            $side * $side);
}
  
// Driver Code
  
$side = 4;
echo("Area of Regular Octagon = ");
echo(areaOctagon($side));
  
// This code is contributed by vt_m.
?>

chevron_right



Output :

Area of Regular Octagon = 77.2548


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.



Improved By : vt_m