class QuestionSix{



		static double circle(double r){
			final double pi= 3.14159;
			return pi*r*r;
		}

		static double rectangle(double w, double h){
			return w*h;
		}

		static double triangle(double s1, double s2, double s3){
			double s = (s1+s2+s3)/2.0;
				return Math.sqrt(s*(s-s1)*(s-s2)*(s-s3));
			}


		public static void main(String [] args){

				System.out.println("Enter figure and dimensions respectively:");
				String figure = Console.readToken();
				double area = 0;

				if(figure.equals("triangle")){
					double side1 = Console.readDouble();
					double side2 = Console.readDouble();
					double side3 = Console.readDouble();
					area = triangle(side1,side2,side3);
				}
				else if(figure.equals("circle")){
					double radius = Console.readDouble();
					area = circle(radius);
				}
				else if(figure.equals("rectangle"))
				{
					double width = Console.readDouble();
					double height = Console.readDouble();
					area = rectangle( width, height);
				}
				System.out.println("Area = " + area);
		}



}