07. Area of Figures

import java.util.Scanner;

public class Figure {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        String figure = scanner.nextLine();

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

            double area = side * side;

            System.out.printf("%.3f", area);
        }
        else if (figure.equals("rectangle")){
            double sideA = Double.parseDouble(scanner.nextLine());
            double sideB = Double.parseDouble(scanner.nextLine());

            double area = sideA * sideB;

            System.out.printf("%.3f" , area);
        }
        else if (figure.equals("circle")){
            double radius = Double.parseDouble(scanner.nextLine());

            double area = Math.PI * (Math.pow(radius, 2));

            System.out.printf("%.3f", area);
        }
        else if(figure.equals("triangle")){

            Double side = Double.parseDouble(scanner.nextLine());
            Double height = Double.parseDouble(scanner.nextLine());

            double area = (side / 2) * height;

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

    }
}