13b. Area of Figures

/**
 * Project: Simple_Conditions - created by borkins on 2017-03-25.
 */

import java.util.Scanner;

public class _13b_AreaOfFigures
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);

        String figure = scan.nextLine().toLowerCase();
        double area = 0d;

        switch (figure)
        {
            case "square":
                area = Math.pow(Double.parseDouble(scan.nextLine()), 2);
                break;
            case "rectangle":
                double a = Double.parseDouble(scan.nextLine());
                double b = Double.parseDouble(scan.nextLine());
                area = a * b;
                break;
            case "circle":
                area = Math.pow(Double.parseDouble(scan.nextLine()), 2) * Math.PI;
                break;
            case "triangle":
                double c = Double.parseDouble(scan.nextLine());
                double h = Double.parseDouble(scan.nextLine());
                area = c * h / 2d;
                break;
        }
        System.out.printf("%.3f", area);
    }
}