Area of Pentagon

import java.util.Scanner;
class Pentagon{

 public static void main(String[] args) {
 
  int side;
  float area;
  Scanner sc = new Scanner(System.in);

   System.out.println("\nEnter the length of side :");

    side = sc.nextInt();

   area = (float)(Math.sqrt(5*(5+2 * Math.sqrt(5)))* side * side)/4;
   System.out.println("\nArea of regular pentagon:"+area);

    }
  }
  
Output : 

   
 
      
  Enter the length of side :
  5
  Area of regular pentagon:43.011936