# Program to Calculate the Perimeter of a Decagon

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
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

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

 ` `

Output:

```The Perimeter of Decagon is : 50
```

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Improved By : jit_t, vt_m, SURENDRA_GANGWAR