Another Simple Proof of Pascal’s Theorem

Summary

We give another simple proof of Pascal’s theorem, based on the use of directed angles and directly similar quadrilaterals.

MSC::

• 51M04

Acknowledgments

The author would like to thank the Editor and an anonymous referee for their careful reading and valuable comments.

Additional information

Notes on contributors

Quang Hung Tran

Quang Hung Tran (ORCID 0000-0003-2468-4972) received his Master’s degree in mathematics in 2011 from the Vietnam National University. Besides teaching geometry at the High School for Gifted Students (HSGS) of Vietnam National University, he enjoys exploring different areas of geometry such as the history of Euclidean geometry, non-Euclidean geometry, multi-dimensional Euclidean geometry, analytic geometry, and projective geometry. When not teaching or doing mathematics, he loves to read and spend time with his family.