public TCircle(TCircle c)
{
this.R = c.R;
this.S = Square();
this.L = Length();
Print();
}
static void Main(string[] args)
{
try
{
TCircle circle = new TCircle();
Console.WriteLine();
circle += 7;
Console.WriteLine();
circle *= 2;
Console.WriteLine();
circle -= 7;
Console.WriteLine();
TCone cone = new TCone(3);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}