using System;

public class CircleAreaCalculator

{

public static void Main ()

{

Console.Write("Enter the radius of the circle: ");

​

if (double.TryParse(Console.ReadLine(), out double radius) && radius > 0)

{

​

double area = Math.PI * radius * radius;

Console.WriteLine($"The area of the circle with radius {radius} is: {area:F2}");

}

else

{

Console.WriteLine("Please enter a valid positive number for radius.");

}}}