# Program to Calculate the Perimeter of a Decagon

• Last Updated : 01 Apr, 2021

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 ``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 ` `// 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

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## Javascript

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Output:
`The Perimeter of Decagon is : 50`

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