Java Program to Find Area and Perimeter of Pentagon

import java.util.Scanner;
public class Main
{
 public static void main(String[] args) 
 {
      //creating Scanner class object
      Scanner sc=new Scanner(System.in);
      //Enter side length of pentagon
      System.out.println("Enter side length of Pentagon :");
      double a = 5.5;
      double area = (Math.sqrt(5*(5+2*Math.sqrt(5)))*Math.pow(a,2))/4.0;
      double perimeter = (5*a);
      System.out.println("Area of Pentagon = "+area);
      System.out.println("Perimeter of Pentagon = "+perimeter);
 }
}

Output:

Enter side length of Pentagon : 5.5
Area of Pentagon = 52.04444136781625
Perimeter of Pentagon = 27.5