HW5.35

 1 import java.util.Scanner;
 2 
 3 public class Solution
 4 {
 5     public static void main(String[] args)
 6     {
 7         Scanner input = new Scanner(System.in);
 8 
 9         System.out.print("Enter the length of side: ");
10         double side = input.nextDouble();
11 
12         input.close();
13 
14         System.out.println(getArea(side));
15     }
16 
17     public static double getArea(double side)
18     { return 5 * side * side / ( 4 * Math.tan(Math.PI / 5)); }
19 }