Given side of a Decagon, the task is to find out the Perimeter of the Decagon.**Explanation : **In geometry, a decagon is a ten-sided polygon or 10-gon. A regular decagon has all sides of equal length and each internal angle will always be equal to 144 degrees.

**Examples**:

Input : S = 5 Output : The Perimeter of Decagon is : 50 Input : S = 8 Output : The Perimeter of Decagon is : 80

**The formula for finding the Perimeter of the Decagon is:**

Perimeter = 10 * S where "S" is the side of the Decagon

Below is the program to find perimeter of decagon:

## C++

`// C++ program to Calculate the Perimeter of a Decagon` `#include <iostream>` `using` `namespace` `std;` `// Function for finding the perimeter` `void` `CalPeri()` `{` ` ` `int` `s = 5, Perimeter;` ` ` `Perimeter = 10 * s;` ` ` `cout << ` `"The Perimeter of Decagon is : "` ` ` `<< Perimeter;` `}` `// Driver code` `int` `main()` `{` ` ` `CalPeri();` ` ` `return` `0;` `}` |

## C

`// C program to Calculate the Perimeter of a Decagon` `#include <stdio.h>` `// Function for finding the perimeter` `void` `CalPeri()` `{` ` ` `int` `s = 5, Perimeter;` ` ` `Perimeter = 10 * s;` ` ` `printf` `(` `"The Perimeter of Decagon is : %d"` `,` ` ` `Perimeter);` `}` `// Driver code` `int` `main()` `{` ` ` `CalPeri();` ` ` `return` `0;` `}` |

## Java

`/*package whatever //do not write package name here */` `// Java program to Calculate the Perimeter of a Decagon` `import` `java.io.*;` `class` `GFG {` `// Function for finding the perimeter` `static` `void` `CalPeri()` `{` ` ` `int` `S = ` `5` `, Perimeter;` ` ` `Perimeter = ` `10` `* S;` ` ` `System.out.println(` `"The Perimeter of Decagon is : "` `+` ` ` `Perimeter);` `}` `// Driver code` ` ` `public` `static` `void` `main (String[] args) {` ` ` `CalPeri();` ` ` `}` `}` `//This Code is contributed by ajit` |

## Python3

`# Python3 program to Calculate` `# the Perimeter of a Decagon` `# Function for finding the` `# perimeter` `def` `CalPeri():` ` ` `s ` `=` `5` ` ` `Perimeter ` `=` `10` `*` `s` ` ` `print` `(` `"The Perimeter of Decagon is : "` ` ` `, Perimeter)` `# Driver code` `if` `__name__ ` `=` `=` `'__main__'` `:` ` ` `CalPeri();` `# This code is contributed by` `# Surendra_Gangwar` |

## C#

`// C# program to Calculate the` `// Perimeter of a Decagon` `using` `System;` `class` `GFG` `{` `// Function for finding the perimeter` `static` `void` `CalPeri()` `{` ` ` `int` `S = 5, Perimeter;` ` ` `Perimeter = 10 * S;` ` ` `Console.WriteLine(` `"The Perimeter of "` `+` ` ` `"Decagon is : "` `+` ` ` `Perimeter);` `}` `// Driver code` `public` `static` `void` `Main ()` `{` ` ` `CalPeri();` `}` `}` `// This Code is contributed` `// by anuj_67` |

## PHP

`<?php` `// PHP program to Calculate the Perimeter of a Decagon` `function` `CalPeri(` `$s` `)` `{` ` ` `$Perimeter` `= 10 * ` `$s` `;` ` ` `echo` `"The Perimeter of Decagon is : $Perimeter"` `;` `}` `// Driver Code` `$s` `= 5;` `CalPeri(` `$s` `);` `?>` |

## Javascript

`<script>` `// JavaScript program to Calculate the Perimeter of a Decagon ` `// Function for finding the perimeter` ` ` `function` `CalPeri() {` ` ` `var` `S = 5, Perimeter;` ` ` `Perimeter = 10 * S;` ` ` `document.write(` `"The Perimeter of Decagon is : "` `+ Perimeter);` ` ` `}` ` ` `// Driver code` ` ` ` ` `CalPeri();` `// This code contributed by gauravrajput1` `</script>` |

**Output:**

The Perimeter of Decagon is : 50

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