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Java Program to Find the Perimeter of a Circle
In this article, we will understand how to find the perimeter of a circle. The circumference is the perimeter of a circle. It's the distance around a circle.
Circumference is given by the formula C = 2𝜋\pi r where, \pi𝜋 = 3.14 and r is the radius of the circle −
Below is a demonstration of the same −
Input
Suppose our input is −
Radius of the circle : 5
Output
The desired output would be −
Perimeter of Circle is: 31.428571428571427
Algorithm
Step 1 - START Step 2 - Declare 2 double values namely my_radius and my_perimeter Step 3 - Read the required values from the user/ define the values Step 4 – Calculate the perimeter using the formula using the formula (2*22*7)/7 and store the result. Step 5- Display the result Step 6- Stop
Example 1
Here, the input is being entered by the user based on a prompt. You can try this example live in ourcoding ground tool 
.
import java.util.Scanner;
public class PerimeterOfCircle{
public static void main(String args[]){
double my_radius, my_perimeter;
System.out.println("Required packages have been imported");
Scanner my_scanner = new Scanner(System.in);
System.out.println("A reader object has been defined ");
System.out.print("Enter the radius of the circle : ");
my_radius = my_scanner.nextDouble();
my_perimeter =(22*2*my_radius)/7 ;
System.out.println("The perimeter of Circle is: " +my_perimeter);
}
}Output
Required packages have been imported A reader object has been defined Enter the radius of the circle : 5 The perimeter of Circle is: 31.428571428571427
Example 2
Here, the integer has been previously defined, and its value is accessed and displayed on the console.
public class PerimeterOfCircle{
public static void main(String args[]){
double my_radius, my_perimeter;
my_radius = 5;
System.out.println("The radius of the circle is defined as " +my_radius);
my_perimeter =(22*2*my_radius)/7 ;
System.out.println("The perimeter of Circle is: " +my_perimeter);
}
}Output
The radius of the circle is defined as 5.0 The perimeter of Circle is: 31.428571428571427
Updated on: 21-Feb-2022
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