import java.util.Scanner;
public class polygon {
/** Main Method */
public static void main(String[] args) {
Scanner input = new Scanner(System.in); // Create a Scanner
// Prompt the user to enter the number of sides
// and the side of a regular polygon
System.out.print("Enter the number of sides: ");
int n = input.nextInt();
System.out.print("Enter the side: ");
double side = input.nextDouble();
// Display the area of the regular polygon
System.out.println("The area of the polygon is " + area(n, side));
}
/** Method area computes and returns the area of a regular polygon */
public static double area(int n, double side) {
return (n * Math.pow(side, 2) / (4 * Math.tan(Math.PI / n)));
}
}
