import java.util.Scanner;//import scanner
import java.text.DecimalFormat; //import Decimal Format

/*Name:Chris McGlynn
Date:30/9/19
Program to calculate area of grass in a garden with a circular pond in it
 */


public class Garden {

    public static void main (String []args){

        //initalise the decimal format
        DecimalFormat df = new DecimalFormat ("0.00");

        //initialise the scanner
        Scanner keyboard=new Scanner (System.in);


        System.out.println("What is the length of the lawn?");//user to input length
        double lawnLength=(keyboard.nextDouble());

        System.out.println("What is the radius of the pond?");//user to input radius of pond
        double radiusOfGardenPond=(keyboard.nextDouble());


        double areaOfGardenLawn= Math.pow(lawnLength, 2);//formula for area of lawn
        double areaOfPond= Math.PI * Math.pow(radiusOfGardenPond, 2); //formula for area of pond

        double areaOfGrass=areaOfGardenLawn-areaOfPond;

        System.out.println ("The area of the garden is "+df.format(areaOfGardenLawn));
        System.out.println ("The area of the pond is "+df.format (areaOfPond));
        System.out.println ("The area of grass in the garden is "+df.format(areaOfGrass));






    }//main
}//class