Let’s learn java program to find circumference of a circle.

## Java program to find circumference of a circle

To calculate circumference of circle in java, first we have to get radius of circle from user using nextInt() method of Scanner class.

This user entered number is stored in integer variable “radius”. Then find circumference of a circle using below formula.

Also read – java program to find area of circle and rectangle

To find circumference of a circle formula is,

circumference = 2πr

Circumference of circle is twice the product of radius and value of PI.

This product is stored in double variable “circumference”.

Also read – java program to find area of circle and rectangle using interface

Lastly circumference is printed on console. Here’s the java program to calculate circumference of circle.

import java.util.Scanner; public class CircumferenceOfCircleJava { public static void main(String[] args) { int radius; double circumference; Scanner sc = new Scanner(System.in); System.out.println("Please enter the radius : "); radius = sc.nextInt(); // double radius circumference = Math.PI * 2 * radius; System.out.println("Circumference of circle : " + circumference); sc.close(); } }

**Output:**

Please enter the radius : 10

Circumference of circle : 62.83185307179586

Also read – java program to find area of rectangle

Also read – java program to find area of circle

Also read – java program to find area of circle using class and object

**java program to find perimeter of a circle**

Here’s java program to find perimeter of a circle.

import java.util.Scanner; public class PerimeterOfCircle { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Please enter the radius of the circle: "); double radius = sc.nextDouble(); System.out.println("Perimeter of a circle: " + (2 * radius * Math.PI)); sc.close(); } }

**Output:**

Please enter the radius of the circle: 5

Perimeter of a circle: 31.41592653589793

Also read – java program to calculate area of circle, rectangle and triangle using switch statement

Also read – java program to find area of circle using bufferedreader