static void Main(string[] args)
{
/*вычисление углов в градусах
* вычисление длин диагоналей
* вычисление длин сторон
* вычисление периметра
* вычисление площади
*/
double a, b, c, d, d1, d2;
Console.WriteLine("\n\nPARALLELOGRAM:");
Parallelogram parallelogram = new Parallelogram(-3, 1, -4, 4, 0, 4, 1, 1);
parallelogram.DisplayPoints();
parallelogram.GetAngles(out a, out b, out c, out d);
Console.WriteLine($"ANGLES:\nA = {a}\nB = {b}\nC = {c}\nD = {d}");
parallelogram.GetDiagonalsLength(out d1, out d2);
Console.WriteLine($"\nDIAGONALS:\nd1 = {d1}\nd2 = {d2}");
parallelogram.GetSides(out a, out b, out c, out d);
Console.WriteLine($"\nSIDES:\na = {a}\nb = {b}\nc = {c}\nd = {d}");
Console.WriteLine($"Perimeter = {parallelogram.GetPerimeter()}");
Console.WriteLine($"Area = {parallelogram.GetArea()}");
Console.WriteLine("\n\nRHOMBUS:");
Rhombus rhombus = new Rhombus(-1, -2, 0, 0, 1, -2, 0, -3);
rhombus.DisplayPoints();
rhombus.GetAngles(out a, out b, out c, out d);
Console.WriteLine($"ANGLES:\nA = {a}\nB = {b}\nC = {c}\nD = {d}");
rhombus.GetDiagonalsLength(out d1, out d2);
Console.WriteLine($"\nDIAGONALS:\nd1 = {d1}\nd2 = {d2}");
rhombus.GetSides(out a, out b, out c, out d);
Console.WriteLine($"\nSIDES:\na = {a}\nb = {b}\nc = {c}\nd = {d}");
Console.WriteLine($"Perimeter = {rhombus.GetPerimeter()}");
Console.WriteLine($"Area = {rhombus.GetArea()}");
Console.WriteLine("\n\nSQUARE:");
Square sqaure = new Square(1, 1, 1, 3, 3, 3, 3, 1);
sqaure.DisplayPoints();
sqaure.GetAngles(out a, out b, out c, out d);
Console.WriteLine($"ANGLES:\nA = {a}\nB = {b}\nC = {c}\nD = {d}");
sqaure.GetDiagonalsLength(out d1, out d2);
Console.WriteLine($"\nDIAGONALS:\nd1 = {d1}\nd2 = {d2}");
sqaure.GetSides(out a, out b, out c, out d);
Console.WriteLine($"\nSIDES:\na = {a}\nb = {b}\nc = {c}\nd = {d}");
Console.WriteLine($"Perimeter = {sqaure.GetPerimeter()}");
Console.WriteLine($"Area = {sqaure.GetArea()}");;
Console.ReadKey();
}