static void Main(string[] args)
{
// statikuri metodebia da gadaecemat obieqtebi
Triangle tri = new Triangle(20, 30, 10);
Triangle_child tri2 = new Triangle_child(30, 50, 5);
Console.WriteLine(Triangle_child.this_peri(tri2));
Console.WriteLine(Triangle_child.parent_peri(tri));
Console.WriteLine(Car.CalcDis(20, 40));
Console.WriteLine(Car.CalcDis((float)20.3, 40));
}
public static float this_peri(Triangle_child x) => x.a + x.b + x.c;