Java program to calculate circle circumference

Following program shows you how to calculate circle circumference.
In this program we get circle radius from user and calculate circumference using following formula
Circumference = 2 X PI X r

import java.util.Scanner;

public class MathGeometry9 {

    public static void main(String[] args) {

        double circleRadius;

        Scanner in = new Scanner(System.in);

        System.out.println("Please enter the radius of circle:");
        circleRadius = in.nextDouble();

        double circumferenceOfCircle = 2 * Math.PI * circleRadius;
        System.out.println("Circumference of circle is: " + circumferenceOfCircle);

    }
}

Output:

Please enter the radius of circle:
4
Circumference of circle is: 25.132741228718345