how can i Remove the fillet at corner in below pics
One way could be to get the longest curves in the polycurve, extend the ends by something reasonable both sides, get the intersections of these longer curves and build a polygon from those intersection points.
However, there are many ways to skin a cat (or so I’m told… although I have never tried… I happen to like cats for their personalities and not just their fur) so I’m sure there are other and maybe better ways to do this. 
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