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; ` `} ` |

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## 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. ` |

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## 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. ` |

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## 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. ` |

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## 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. ` `?> ` |

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Output:

Surface area of octahedron =169.741

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