Question

Write a program in java to input the number of sides of a polygon and then determine whether it is a hexagon, pentagon, rectangle or a triangle. If the number of sides are either one or two then the invalid input message should be displayed. (Input has to be taken by Scanner class)

Answer 1

Answer:

import java.util.Scanner;

public class Exercise {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

System.out.print("Input the number of sides on the polygon: ");

int ns = input.nextInt();

System.out.print("Input the length of one of the sides: ");

double side = input.nextDouble();

System.out.print("The area is: " + polygonArea(ns, side)+"\n");

}

public static double polygonArea(int ns, double side) {

return (ns * (side * side)) / (4.0 *Math.tan((Math.PI / ns)));

}

}

Hope you got it....