AreaOfFigures

package firstStepsInCodingLab;

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;

            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);

        }
    }