# Polyhex Tetrads

A *tetrad* is a plane figure made of four congruent shapes,
joined so that each shares a boundary with each.
The smallest polyhex tetrads use tetrahexes.
The first, by Scott Kim,
is from Gardner's book.

## Symmetric Tiles

The smallest tetrad for a
polyhex with birotary symmetry uses 6-hexes:

The smallest tetrads for polyhexes with vertical mirror symmetry
use 7-hexes:

The smallest tetrads for polyhexes with birotary symmetry around a cell
use 9-hexes:

The smallest tetrad for polyhexes with ternary symmetry
uses 9-hexes:

The smallest tetrad for polyhexes with ternary symmetry about a cell
uses 13-hexes:

The smallest holeless tetrad for symmetric polyhexes
uses 9-hexes:

*Last revised 2018-11-14.*

Back to Polyform Tetrads
< Polyform Curiosities

Col. George Sicherman
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