public Form1()
{
InitializeComponent();
List <Point2D> points = new List <Point2D>();
points.Add(new Point2D(2, 1));
points.Add(new Point2D(5, 1));
points.Add(new Point2D(2, 4));
points.Add(new Point2D(4, 2));
points.Add(new Point2D(5, 4));
double angle = Point2D.Angle(new Point2D(5, 4), new Point2D(5, 1));
var shell = JarvisAlgorithm.FindShell(points);
}