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());
		}
	}
};