백준 3053 자바 - 택시 기하학

// 택시 기하학
package Bronze_III_3;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Ex3053 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        double r = Double.parseDouble(br.readLine());

        System.out.println(r * r * Math.PI);
        System.out.println(2 * r * r);
    }
}