13a. Area of Figures

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

import java.util.Scanner;

public class _13a_AreaOfFigures
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);

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

        if (figure.equals("square"))
        {
            area = Math.pow(Double.parseDouble(scan.nextLine()), 2);
        }
        else if (figure.equals("rectangle"))
        {
            double a = Double.parseDouble(scan.nextLine());
            double b = Double.parseDouble(scan.nextLine());
            area = a * b;
        }
        else if (figure.equals("circle"))
        {
            area = Math.pow(Double.parseDouble(scan.nextLine()), 2) * Math.PI;

        }
        else if (figure.equals("triangle"))
        {
            double c = Double.parseDouble(scan.nextLine());
            double h = Double.parseDouble(scan.nextLine());
            area = c * h / 2d;
        }
        System.out.printf("%.3f", area);
    }
}