static void Main(string[] args)
{
MyRectangle rect = new MyRectangle(8, 4);
Console.WriteLine(rect.GetArea());
Console.WriteLine(rect.GetPerimeter());
Console.WriteLine(rect.About());
Console.WriteLine("----");
Random
MyVolumeRectangle vrect = new MyVolumeRectangle(2, 1, 4);
Console.WriteLine(vrect.GetArea());
Console.WriteLine(vrect.GetPerimeter());
Console.WriteLine(vrect.GetVolume());
Console.WriteLine(vrect.About());
Console.ReadLine();
}