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 https://www.codeproject.com/Articles/204/Rotate-Your-Graphics-Advanced-Memory-Device-Contex

 https://en.wikipedia.org/wiki/Rotation_matrix

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 https://doc.cgal.org/latest/Manual/packages.html

 https://en.wikipedia.org/wiki/CGAL

 https://awesomeopensource.com/projects/computational-geometry

 https://en.wikipedia.org/wiki/Category:Geometric_algorithms

 https://stackoverflow.com/questions/50084195/rotation-program-in-c

https://en.wikipedia.org/wiki/Rotation_(mathematics)