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package fun;

public class Fun18 {

public static void main(String[] args) {

System.out.printf("%.4f\n",Doira(2.4));

System.out.printf("%.4f\n", Doira(1.3));

System.out.printf("%.4f\n",Doira(1.7));

}

public static double Doira(double r){

double PI =3.1415;

double s= PI*(r*r);

return s;

}

}