using System;
public class Program
{
public static void Main()
double tq,nq,mc,mhc;
Console.WriteLine("ادخل طول قطر الدائرة:");
tq=double.Parse(Console.ReadLine());
nq=tq/2;
mc=nq*nq*3.14159;
mhc=tq*3.14159;
Console.WriteLine("the nq is={0}",nq);
Console.WriteLine("the mc is={0} and the mhc is={1}",mc,mhc);
}