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URI Problem (Area of a Circle) 1002:
Area of a Circle is a basic problem on URI online judge for novice problem solver.
You can find details on this Link.

import java.util.Scanner;

/**
 * @Author : Muhammad Harun-Or-Roshid
 * @Date   : Oct 5, 2016
 * @Time   : 7:52:48 PM
 */
public class Uri1002 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double R = sc.nextDouble();
        double A = (3.14159*R*R);
        System.out.printf("A=%.4f\n",A);
    }
}

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