# C++ Exercises: Print the area of a polygon

## C++ Basic: Exercise-58 with Solution

Write a C++ program to print the area of a polygon.

**Visual Presentation:**

**Sample Solution**:

**C++ Code :**

```
#include <iostream> // Including input-output stream header file
#include <math.h> // Including math functions header file
using namespace std; // Using the standard namespace
int main() { // Start of the main function
float ar, s, n; // Declaration of variables 'ar', 's', and 'n' to store area, side length, and number of sides respectively
cout << "\n\n Print the area of a polygon:\n"; // Displaying the purpose of the program
cout << "---------------------------------\n";
cout << " Input the number of sides of the polygon: "; // Prompting user to input the number of sides
cin >> n; // Taking input from user and storing it in variable 'n'
cout << " Input the length of each side of the polygon: "; // Prompting user to input the side length
cin >> s; // Taking input from user and storing it in variable 's'
// Calculating the area of the polygon using the formula: n * s^2 / (4 * tan(π / n))
ar = (n * (s * s)) / (4.0 * tan((M_PI / n))); // M_PI represents the value of π
cout << " The area of the polygon is: " << ar << "\n"; // Displaying the calculated area
return 0; // Returning 0 to indicate successful program execution
}
```

Sample Output:

Print the area of a polygon: --------------------------------- Input the number of sides of the polygon: 7 Input the length of each side of the polygon: 6 The area of the ploygon is: 130.821

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