Saturday, 20 August 2016

Chapter 6 Exercise 35, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

6.35 (Geometry: area of a pentagon) The area of a pentagon can be computed using the following formula:

Write a method that returns the area of a pentagon using the following header: public static double area(double side) Write a main method that prompts the user to enter the side of a pentagon and displays its area. Here is a sample run: Enter the side: 5.5 The area of the pentagon is 52.04444136781625.

import java.util.Scanner;
public class ProgrammingExercise6_35 {
 public static void main(String[] args) {
  Scanner input= new Scanner(;
  System.out.print("Enter the side:");
  double s = input.nextDouble();
  System.out.println("The area of the pentagon is " + area(s));
public static double area(double side) {
  return 5*Math.pow(side, 2)/(4*Math.tan(Math.PI/5));

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