private void RectanglesTestForm_Load(object sender, EventArgs e)
{
Quadrangle quadrangle = new Quadrangle(
new PointD(90, 100),
new PointD(100, 220),
new PointD(200, 200),
new PointD(200, 100));
Console.WriteLine(quadrangle.ToString());
tab = quadrangle.ToDrawingTable(ClientRectangle.Height);
}