07. Area of Figures

import java.util.Scanner;

public class P07AreaOfFigures {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String typeFigure = scanner.nextLine();

        double area = 0;
        if (typeFigure.equals("square")) {
            double side = Double.parseDouble(scanner.nextLine());

            area = side * side;

        } else if (typeFigure.equals("rectangle")) {
            double length = Double.parseDouble(scanner.nextLine());
            double width = Double.parseDouble(scanner.nextLine());

            area = length * width;

        } else if (typeFigure.equals("circle")) {
            double radius = Double.parseDouble(scanner.nextLine());

            area = Math.PI * radius * radius;

        } else if (typeFigure.equals("triangle")) {
            double base = Double.parseDouble(scanner.nextLine());
            double height = Double.parseDouble(scanner.nextLine());


        }

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