Basic Java Simple Calculations-06. Circle Area and Perimeter

import java.util.Scanner;

public class CircleAreaAndPerimeter1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double r = Double.parseDouble(scanner.nextLine());

        double area = Math.PI *r * r;
        double perimeter = 2 * Math.PI * r;
        System.out.println("Area = " + area);
        System.out.println("Perimeter = " + perimeter);
    }
}