import java.util.*;

interface Figure {
    public double getArea();
    public double getPerimeter();
}

class Triangle implements Figure {
    private double a;
    private double b;
    private double c;

    public Triangle(double a, double b, double c){
        this.a = a;
        this.b = b;
        this.c = c;
    }

    public double getArea(){
        double s = getPerimeter() / 2;
        return Math.sqrt(s * (s - a) * (s - b) * (s - c));
    }
    public double getPerimeter(){
        return a + b + c;
    }
}

class SmallTriangle extends Triangle {
    public SmallTriangle(){
        super(1,1,1);
    }
}
class BigTriangle extends Triangle {
    public BigTriangle(){
        super(10,10,10);
    }
}

class Circle implements Figure {
    private double radius;

    public Circle(double radius){
        this.radius = radius;
    }
    public double getArea(){
        return Math.PI * radius * radius;
    }
    public double getPerimeter(){
        return Math.PI * radius * 2;
    }
}

public class Application {
    public static void main(String[] args){
        ArrayList<Figure> figures = new ArrayList<>();
        figures.add(new Triangle(1, 1, 1));
        figures.add(new SmallTriangle());
        figures.add(new BigTriangle());
        figures.add(new Circle(10));

        for(int i = 0; i < figures.size(); ++i){
            System.out.println(figures.get(i).getArea() + " " + figures.get(i).getPerimeter());
        }
    }
};