Necessary and sufficient properties for a cyclic quadrilateral

@article{Fraivert2019NecessaryAS,
  title={Necessary and sufficient properties for a cyclic quadrilateral},
  author={David Fraivert and Avi Sigler and Moshe Stupel},
  journal={International Journal of Mathematical Education in Science and Technology},
  year={2019},
  volume={51},
  pages={913 - 938}
}
ABSTRACT There are many problems whose solution requires proof that a quadrilateral is cyclic. The main reason for writing this paper is to offer a number of new tools for proving that a particular quadrilateral is cyclic, thus expanding the present knowledge base and ensuring that investigators in mathematics and teachers of mathematics have at their disposal the most suitable tool available for solving the problem at hand. This present paper presents an overall summary and further development… 

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