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

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Degrees in celsius = ");
            var celsius = double.Parse(Console.ReadLine());
            var fahrenheit = (celsius *9/5 +32);

            fahrenheit =  Math.Round(fahrenheit, 2);

            Console.WriteLine("Degrees in Fahrenheit = " + fahrenheit);


        }
    }
}



-------------------------------------------------------------------------------------
10-та

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

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("radians = ");
            var radians = double.Parse(Console.ReadLine());
            var degrees = (radians * 180/Math.PI);

            degrees =  Math.Round(degrees, 0);

            Console.WriteLine("Degrees = " + degrees);
        }
    }
}

-----------------------------------------------------------------
11та

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

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("USD = ");
            var dollars = double.Parse(Console.ReadLine());
            var lev = (dollars * 1.79549);

            lev =  Math.Round(lev, 2);

            Console.WriteLine("BGN = " + lev);
        }
    }
}