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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



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