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Following program shows you how to calculate circle circumference.
In this program we get circle radius from user and calculate circumference using following formula
Circumference = 2 X PI X r

using System;

class MainClass {
  public static void Main (string[] args) {
    Console.WriteLine ("Please enter the radius of circle:");
    double circleRadius = Convert.ToDouble(Console.ReadLine());

    double circumferenceOfCircle = 2 * Math.PI * circleRadius;
    Console.WriteLine("Circumference of circle is: " + circumferenceOfCircle);

  }
}

Output:

Please enter the radius of circle:
 7
Circumference of circle is: 43.9822971502571



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