using System;

​

/* DO NOT USE CONSOLE.WRITELINE() OUTSIDE OF MAIN */

public class Program

{

    public static void Main()

    {

        Console.WriteLine("What do you want to do?\n");

        Console.WriteLine("\tA:getHypotenuse()\n\tB:isIsosceles()\n\tC:isEquilateral()\n\tD:getAngle()\n\tE:getArea()\n\tF:getPerimeter()\n");

        string choice = Console.ReadLine().ToUpper();

        double a;

        double b;

        double c;

        double tBase;

        double tHeight;

        switch (choice)

        {

            case "A":

                Console.WriteLine("Enter length of side a");

                a = Double.Parse(Console.ReadLine());

                Console.WriteLine("Enter length of side b");

                b = Double.Parse(Console.ReadLine());

                Console.WriteLine(getHypotenuse(a, b));

                break;

            case "B":

                Console.WriteLine("Enter length of side a");

                a = Double.Parse(Console.ReadLine());

                Console.WriteLine("Enter length of side b");

                b = Double.Parse(Console.ReadLine());

                Console.WriteLine("Enter length of side c");

                c = Double.Parse(Console.ReadLine());

                Console.WriteLine(isIsosceles(a, b, c));

                break;

            case "C":

                Console.WriteLine("Enter length of side a");

                a = Double.Parse(Console.ReadLine());

                Console.WriteLine("Enter length of side b");

                b = Double.Parse(Console.ReadLine());

                Console.WriteLine("Enter length of side c");

                c = Double.Parse(Console.ReadLine());

                Console.WriteLine(isEquilateral(a, b, c));

                break;

            case "D":

                Console.WriteLine("Enter the size of angle 1");

                a = Double.Parse(Console.ReadLine());

                Console.WriteLine("Enter the size of angle 2");

                b = Double.Parse(Console.ReadLine());

                Console.WriteLine(getAngle(a, b));

                break;

            case "E":

                Console.WriteLine("Enter length of base");

                tBase = Double.Parse(Console.ReadLine());

                Console.WriteLine("Enter length of height");

                tHeight = Double.Parse(Console.ReadLine());

                Console.WriteLine(getArea(tBase, tHeight));

                break;

            case "F":

                Console.WriteLine("Enter length of side a");

                a = Double.Parse(Console.ReadLine());

                Console.WriteLine("Enter length of side b");

                b = Double.Parse(Console.ReadLine());

                Console.WriteLine("Enter length of side c");

                c = Double.Parse(Console.ReadLine());

                Console.WriteLine(getPerimeter(a, b, c));

                break;

            default:

                Console.WriteLine("Please try again");

                break;

        }

    }

​

    static double getPerimeter(double a, double b, double c)

    {

        double perimeter = a + b + c;

        return perimeter;

    }

​

    static double getArea(double tBase, double tHeight)

    {

        double area = 0.5 * tBase * tHeight;

        return area;

    }

​

    static double getAngle(double ang1, double ang2)

    {

        double angle = 180 - ang1 - ang2;

        return angle;

    }

​

    static bool isEquilateral(double a, double b, double c)

    {

        if(a == b & b == c)

        {

            return true;

        }

        else

        {

            return false;

        }

    }

​

    static bool isIsosceles(double a, double b, double c)

    {

        if(a == b | b == c | a == c)

        {

            return true;

        }

        else

        {

            return false;

        }

    }

​

    static double getHypotenuse(double a, double b)

    {

        double hypotenuse = Math.Sqrt((a * a) + (b * b));

        return hypotenuse;

    }

}