How to use object retrieved from method

I made a method to create a polygon with hexagonal shape and retrieve it as an object but I don't know how to use said object. The code is as follows:

    public object Hexagon()
    {
        float h;
        float r;
        int x = 20;
        int y = 20;
        int s = 10;

        h = HexOperations.ConvertToFloat(HexOperations.Calc(s));
        r = HexOperations.ConvertToFloat(HexOperations.Calc(s));

        Point[] vert= new Point[6];

        vert[0] = new Point(x, y);
        vert[1] = new Point(x + s, y);
        vert[2] = new Point(x + s + h, y + r);
        vert[3] = new Point(x + s, y + r + r);
        vert[4] = new Point(x, y + r + r);
        vert[5] = new Point(x - h, y + r);

        Polygon pol = new Polygon();

        System.Windows.Media.PointCollection pointC = new System.Windows.Media.PointCollection();

        pointC.Add(vert[0]);
        pointC.Add(vert[1]);
        pointC.Add(vert[2]);
        pointC.Add(vert[3]);
        pointC.Add(vert[4]);
        pointC.Add(vert[5]);

        pol.Points = pointC;

        pol.Stroke = Brushes.Black;

        return pol;
    }

If I add ´MainGrid.Children.Add(pol)´ before the return I can see the hexagon printed on the Grid ´MainGrid´ but I just don't know how to use it outside the said method. I've tried this:

    MainGrid.Children.Add(Hexagon());

Which gives me the error "cannot convert from ´object´ to System.Window.UIElement".

Also tried:

    Polygon poly = new Hexagon();

Which say "a new expression requires (). [], {}, ;, after type".

And:

    Hexagon poly = new Hexagon();

And this obviously gave me the finger. I just don't know what else to try. Probably because I'm making an elemental mistake with my approach but, anyways, thank you in advance.