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  1. import java.util.Scanner;
  2.  
  3. public class Main {
  4.     public static void main(String[] args) {
  5.         Scanner scanner = new Scanner(System.in);
  6.  
  7.         double R = scanner.nextDouble();
  8.         double area=(3.141592653)*(R*R);
  9.         System.out.println(area);
  10.         scanner.close();
  11.  
  12.     }
  13. }
  14.  
Success #stdin #stdout 0.16s 57972KB
comments (?)
stdin 
21
stdout 
1385.442359973
https://ideone.com/NiSSW8
language:
Java (HotSpot 12)
created:
22 days ago
visibility:
public

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