Given the sides of Octahedron then calculate the surface area.

Examples:

Input : 7 Output : 169.741 Input : 9 Output : 280.59

An regular octahedron has eight faces, which are all in the shape of equilateral triangles.The area of an octahedron is 2 multiplied by the length of an edge squared multiplied by the square root of three.

Formula:

Surface area= 2*(sqrt(3))*(side*side)

## C++

`// CPP Program to calculate` `// surface area of Octahedron` `#include <bits/stdc++.h>` `using` `namespace` `std;` `// utility Function` `double` `surface_area_octahedron(` `double` `side)` `{` ` ` `return` `(2*(` `sqrt` `(3))*(side*side));` `}` `// Driver Function` `int` `main()` `{` ` ` `double` `side = 7;` ` ` `cout << ` `"Surface area of octahedron ="` ` ` `<< surface_area_octahedron(side)` ` ` `<< endl;` `}` |

## Java

`// Java Program to calculate` `// surface area of Octahedron.` `import` `java.io.*;` `import` `java.util.*;` `class` `GFG {` ` ` `// utility Function` `static` `double` `surface_area_octahedron(` `double` `side)` `{` ` ` `return` `(` `2` `*(Math.sqrt(` `3` `))*(side*side));` `}` ` ` `public` `static` `void` `main (String[] args) {` ` ` `double` `side = ` `7` `;` ` ` `System.out.println(` `"Surface area of octahedron ="` ` ` `+ surface_area_octahedron(side));` ` ` ` ` `}` `}` `// This code is contributed by Gitanjali.` |

## Python3

`# Python Program to calculate` `# surface area of Octahedron.` `import` `math` `# utility Function` `def` `surface_area_octahedron( side):` ` ` `return` `(` `2` `*` `(math.sqrt(` `3` `))` `*` `(side` `*` `side))` `# driver code` `side ` `=` `7` `print` `(` `"Surface area of octahedron ="` `,` ` ` `surface_area_octahedron(side))` `# This code is contributed by Gitanjali.` |

## C#

`// C# program to calculate` `// surface area of Octahedron.` `using` `System;` `class` `GFG {` ` ` `// utility Function` ` ` `static` `double` `surface_area_octahedron(` `double` `side)` ` ` `{` ` ` `return` `(2 * (Math.Sqrt(3)) * (side * side));` ` ` `}` ` ` ` ` `// Driver code` ` ` `public` `static` `void` `Main()` ` ` `{` ` ` `double` `side = 7;` ` ` `Console.WriteLine(` `"Surface area of octahedron ="` ` ` `+ surface_area_octahedron(side));` ` ` `}` `}` `// This code is contributed by vt_m.` |

## PHP

`<?php` `// PHP Program to calculate` `// surface area of Octahedron` `// utility Function` `function` `surface_area_octahedron(` `$side` `)` `{` ` ` `return` `(2 * (sqrt(3)) *` ` ` `(` `$side` `* ` `$side` `));` `}` `// Driver Code` `$side` `= 7;` `echo` `(` `"Surface area of octahedron ="` `);` `echo` `( surface_area_octahedron(` `$side` `));` `// This code is contributed by vt_m.` `?>` |

## Javascript

`<script>` `// JavaScript program to calculate` `// surface area of Octahedron.` `// Utility Function` `function` `surface_area_octahedron(side)` `{` ` ` `return` `(2 * (Math.sqrt(3)) * (side*side));` `}` `// Driver Code` `let side = 7;` `document.write(` `"Surface area of octahedron ="` `+` ` ` `surface_area_octahedron(side));` `// This code is contributed by avijitmondal1998` `</script>` |

**Output: **

Surface area of octahedron =169.741

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