static void Main(string[] args)
{
SquareShape square = new SquareShape();
TriangleShape triangle = new TriangleShape();
CircleShape circle = new CircleShape();
float side = 5;
square.sideLenght = side;
triangle.sideLenght = side;
circle.radius = side;
square.Init();
triangle.Init();
circle.Init();
square.Perimetr();
triangle.Perimetr();
circle.Perimetr();
square.Square();
triangle.Square();
circle.Square();
Console.WriteLine("SquareShape");
Console.WriteLine("perimetr: {0}", square.perimetr);
Console.WriteLine("square: {0}", square.square);
Console.WriteLine("TriangleShape");
Console.WriteLine("perimetr: {0}", triangle.perimetr);
Console.WriteLine("square: {0}", triangle.square);
Console.WriteLine("CircleShape");
Console.WriteLine("perimetr: {0}", circle.perimetr);
Console.WriteLine("square: {0}", circle.square);
}