Area of Figures

import java.util.Scanner;

public class AreaOfFigures {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        String figure = scan.nextLine();
        double side = Double.parseDouble(scan.nextLine());
        //double side2 = Double.parseDouble(scan.nextLine());

        double result = 0;

        if ("square".equals(figure)) {
            result = side * side;
            System.out.println(result);
        } else if ("rectangle".equals(figure)) {
            double side2 = Double.parseDouble(scan.nextLine());
            result = side * side2;
            System.out.println(result);
        } else if ("circle ".equals(figure)) {
            result = Math.PI * side * side;
            System.out.println(result);
        } else if ("triangle".equals(figure)) {
            int side2 = Integer.parseInt(scan.nextLine());
            result = (side * side2) / 2;
            System.out.printf("%f",(result));



        }
    }
}