CS
cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
double pi = 3.14;
double diameter =Convert.ToDouble(Console.ReadLine());
Console.WriteLine(pi*diameter*diameter);
//Thanks for the 100+ views
}
}
}
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OUTPUT
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