AreaOfFigures

package Mentoring27_05;

import java.util.Scanner;

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

        String figure = scanner.nextLine();

        double area = 0.0;

        if (figure.equals("square")){
            double a = Double.parseDouble(scanner.nextLine());

            area = a * a;

        }else if (figure.equals("rectangle")){
            double a = Double.parseDouble(scanner.nextLine());
            double b = Double.parseDouble(scanner.nextLine());

            area = a * b;
        }else if (figure.equals("circle")){
            double r = Double.parseDouble(scanner.nextLine());

            area = Math.PI * r * r;

        }else if (figure.equals("triangle")){
            double a = Double.parseDouble(scanner.nextLine());
            double h = Double.parseDouble(scanner.nextLine());

            area = a * h / 2;
        }

        System.out.printf("%.3f", area);
    }
}