using System;

​

public class Program

{

public static void Main()

{

Console.WriteLine(9+6);

Console.WriteLine(65-50);

Console.WriteLine(7*3);

Console.WriteLine(66/3);

​

//Console.WriteLine("Enter in a number");

//double a = Convert.ToDouble(Console.ReadLine());

//double b = Convert.ToDouble(Console.ReadLine());

//double c = Convert.ToDouble(Console.ReadLine());

//double d = Convert.ToDouble(Console.ReadLine());

//Console.WriteLine(a+b*c-d);

//Console.WriteLine((a+b)*c-d);

//Console.WriteLine(a+b*(c-d));

​

/*double root = Math.Sqrt(144);

Console.WriteLine(root);

​

double numPow= Math.Pow(6,8);

Console.WriteLine(numPow);

​

double numRound = Math.Round(67.32145634);

Console.WriteLine(numRound);

    double num = 67.3214;

   Console.WriteLine(Math.Round(num,4));

​

double side1 = Convert.ToDouble(Console.ReadLine());

double side2 = Convert.ToDouble(Console.ReadLine());

​

Console.WriteLine(2*side1+ 2*side2);*/

​

double r = Convert.ToDouble(Console.ReadLine());

Console.WriteLine(2*r*Math.PI );

​

Console.WriteLine((r*r)*Math.PI );

​

​

Console.WriteLine("enter numbers for hyptenuse");

double sideLengthA =Convert.ToDouble(Console.ReadLine());

​

Console.WriteLine("enter numbers for hyptenuse");

double sideLengthB =Convert.ToDouble(Console.ReadLine());

​

​

​

double hypotenuse = Math.Sqrt(Math.Pow(sideLengthA, 2)+Math.Pow(sideLengthB, 2));

double hypotenuse2 = Math.Round(hypotenuse, 3);

Console.WriteLine("The hypotense is " + hypotenuse2);

​