Radius

// Calculate and return the area of a circle, given the radius.

import java.util.Scanner;

	public class circleArea {
		public static void main (String[] args){
				Scanner input = new Scanner(System.in);

				double radius = input.nextDouble();
				radius = calculateArea(radius);
		
				System.out.println(radius + " square cm ");

				}

				public static double calculateArea(double radius){

					radius = (radius*radius)*3.141592;
					return radius;

		}
	}