hhQuest

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace hhQuest
{
    class Program
    {
        static void Main(string[] args)
        {
            start();
        }
        static void choose(string figure)
        {
            switch (figure)
            {
                case "circle":
                    circle();
                    start();
                    break;
                default:
                    Console.WriteLine("No figure found, enter data again");
                    start();
                    break;
            }

        }
        static void start()
        {
            Console.WriteLine("Choose figure \n circle");
            string figure = Console.ReadLine();
            choose(figure);
        }
        static void circle()
        {
            double square, a, b, c, radius;
            bool isRectangularBool = false;
            Console.WriteLine("Enter radius");
            radius = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("Enter the side of triangle A");
            a = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("Enter the side of triangle A");
            b = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("Enter the side of triangle A");
            c = Convert.ToDouble(Console.ReadLine());
            isRectangularBool = isRectangular(a, b, c);
            square = (a * b * c) / (4 * radius);
            Console.WriteLine("The area of ​​the circle is " + square + ". Is the triangle rectangular ? " + isRectangularBool);
        }
        static bool isRectangular(double a, double b, double c)
        {
            bool isRectangularBool = false;
            double a2, b2, c2;
            a2 = Math.Sqrt((b * b + c * c));
            b2 = Math.Sqrt((a * a + c * c));
            c2 = Math.Sqrt((b * b + a * a));
            if ((a == a2)|| (b == b2)|| (c == c2)) isRectangularBool  = true;
            return isRectangularBool;
        }
    }
}