Question

How to calculate area, diameter and circumference of circle in C#

Answer 1

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            int radius = 3;
            float PI = 3.14f;

            float area = PI * radius * radius;
            Console.WriteLine("Area = {0:F2}", area);

            float diameter = 2 * radius;
            Console.WriteLine("Diameter = {0:F2}", diameter);

            float circumference = 2 * PI * radius;
            Console.WriteLine("Circumference = {0:F2}", circumference);
        }
    }
}

/*
run:
    
Area = 28.26
Diameter = 6.00
Circumference = 18.84
   
*/

 

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