Chapter 1 Question 1.8, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

(Area and perimeter of a circle) Write a program that displays the area and perimeter of a circle that has a radius of 5.5 using the following formula: 

                         perimeter = 2 * radius * π 

                         area = radius * radius * π

Answer

/**

Program - 08

(Area and perimeter of a circle):

Write a program that displays the area and perimeter of a circle that has a radius of 5.5 using the following formula:

                         perimeter = 2 * radius * π

                         area = radius * radius * π

   

**/

public class HelloWorld

{

    public static void main(String args[])

    {    

   

        System.out.println("Perimeter = ");

        System.out.println(2 * 5.5 * 3.14159);

        System.out.println("Area = ");

        System.out.println(5.5 * 5.5 * 3.14159);

    }

}

OUTPUT

Perimeter =

34.55749

Area =

95.0330975

In this program the background knowledge which we have to acquire to solve this program is using:

1) Formula of Area = (length * breadth)

2) Formula of Perimeter = 2(length * breadth)

Note: As  System.out.println();  is used, therefore the value of Area and Perimeter gets printed in the new line.