Further Questions about Tetrads
by Walter Trump

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Letter from Martin Gardner

Tetrads consist of four congruent regions which share boundaries with each of the three others.

T-Tetrad

An old tetrad from 1971 made of mirror symmetric tiles


This site discusses a recreational geometric puzzle. It is not a scientific publication.
After the introductory questions 1 to 3, the questions 4 to 8 are more autobiographical, and relate my own tetrad story. In the other chapters several old and new tetrads are discussed, mainly tetrads made of congruent polygons with certain properties. Also the construction principles of complicated tetrads are explained.

    

A heptagon tetrad with a quadrilateral hole.       The correlations between the angles are noteworthy.

This tetrad was made in February 2020 and consists of four congruent pentagons.


  Tetrads Contents  

 Walter Trump, Nürnberg, Germany, ms(at)trump.de, © 2020-02-12 (last modified: 2020-02-12)