Can I fill the area between some freehand lines?

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Luna

I've drawn four freehand lines which form a noughts and crosses (tic-tac-toe) grid.  How can I fill the central square with colour?

Luna

Actually, I found a way to solve this problem, but I had to redraw my freehand lines.  A single freehand line can be converted to a polygon, and then the polygon can be given a fill colour.