public class Recitation1 {
	public static void main(String[] args) {
		double side1 = 2.3, side2 = 5.9, side3 = 7.2, perimeter, s, area;
		
		perimeter = side1 + side2 + side3;
		s = perimeter/2;
		area = Math.sqrt(s * (s - side1) * (s - side2) * (s - side3));
		
		System.out.println("The lengths of the triangle's sides are " + side1 + ", " + side2 + ", " + side3 + ".");
		System.out.println("The perimeter of the triangle is " + perimeter + ".");
		System.out.println("The area of the triangle is " + area + ".");
	}

}