using System;

​

public class Program

{

    static private double leg(double a, double c)

    {

        return Math.Sqrt(c * c - a * a);

    }

​

    static private double hyp(double a, double b)

    {

        return Math.Sqrt(a * a + b * b);

    }

​

    static private double area(double b, double h)

    {

        return (b*h)/2;

    }

​

    public static void Main()

    {

        string restart = "hello";

        while (restart != "q")

        {

            Console.WriteLine("Type '1' to find a hypotenuse, Type '2' to find a leg, Type '3' to find the area");

            restart:

            string input = Console.ReadLine();

            Console.Clear();

            if (input == "1")

            {

                Console.WriteLine("Please enter 2 legs of the triangle");

                double num1 = double.Parse(Console.ReadLine());

                double num2 = double.Parse(Console.ReadLine());

                double output = hyp(num1, num2);

                Console.WriteLine("The hypotenuse of is " + hyp(num1, num2));

            }

            else if (input == "2")

            {

                oops:

                Console.WriteLine("Please enter the leg of the triangle");

                double num1 = double.Parse(Console.ReadLine());

                Console.WriteLine("Please enter the hypotenuse of the triangle");

                double num2 = double.Parse(Console.ReadLine());

                if (num1 > num2)

                {

                    Console.WriteLine("Leg cannot be bigger than the hypotenuse");

                    goto oops;

                }

                {

                Console.WriteLine("The missing leg of the is " + leg(num1, num2));

            }

            }

            if (input == "3")

            {

                Console.WriteLine("Please enter the base of the triangle");

                double num1 = double.Parse(Console.ReadLine());

                Console.WriteLine("Please enter the height of the triangle");

                double num2 = double.Parse(Console.ReadLine());

                double output = area(num1, num2);

                Console.WriteLine("The area of the triangle is " + area(num1,num2));

            }

​

            else

            {

                Console.WriteLine("Please type '1', '2', or '3'");

                goto restart;

            }

            {

            Console.WriteLine(" ");

            Console.WriteLine("Type 'q' to quit, type anything else to restart");

            restart = Console.ReadLine();

            Console.Clear();

        }

    }

}

}