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- package aoj.contest1398;
- import java.io.PrintWriter;
- import java.util.Scanner;
- public class E {
- static Scanner cin = new Scanner(System.in);
- static PrintWriter cout = new PrintWriter(System.out);
- public static void main(String[] args) {
- int T = cin.nextInt();
- while (T-- > 0) {
- double r = cin.nextDouble();
- cout.println(String.format("%.6f", Math.PI * r * r));
- }
- cin.close();
- cout.close();
- }
- }
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