Kolo

package com.company;

import java.util.Scanner;
import static java.lang.Math.*;

public class Main {

    public static void main(String[] args) {
        System.out.println("Podaj r: ");
        Scanner scanner = new Scanner(System.in);
        double r = scanner.nextInt();
        double pole = perimeter(r);
        double obwod = area(r);
        System.out.println(pole);
        System.out.println(obwod);

    }

    public static double area(double radius) {

        return 2 * PI * radius;
    }

    public static double perimeter(double perimeter){

        return PI * perimeter * perimeter;
    }
}