A regular polygon is an n-sided polygon in which all sides are of the same length and all angles have the same degree(i. e the polygon is both equilateral and equiangular). The formula for computing the area of a re polygon is n * s2(s squar)
area =
4 * tan(pi/n)
write a function that return the area of a regular polygon using the following header.
double area(int n, double side.
write a main function that prompts the user to enter the number of sides and the side of a regular polygon, and display the area.
The program needs to allow the user to run the calculations as needed until the user chooses to end the program.

import java.util.Scanner;

public class Main

{

public static void main(String[] args) {

    Scanner input = new Scanner(System.in);

    int n;

    double side;

    char choice;

    while(true){

        System.out.print("Enter the number of sides: ");

     n = input.nextInt();

     System.out.print("Enter the side of a regular polygon: ");

     side = input.nextDouble();

     System.out.println("Area is: " + area(n, side));

     System.out.print("Do you want to continue(y/n): ");

     choice = input.next().charAt(0);

     if(choice == 'n')

         break;

    }

}

public static double area(int n, double side){

    double area = (n * Math.pow(side, 2) / (4 * Math.tan(Math.PI / n)));

    return area;

}

}

Explanation:

Create a function named area that takes two parameters, n and side

Calculate the area using the given formula

Return the area

In the main:

Create an indefinite while loop. Inside the loop:

Ask the user to enter the n and side

Call the area() function passing the n and side as parameters and print the result

Ask the user to continue or not. If the user enters "n", stop the loop