Tiling a Trapezial Polyhex with Two Pentahexes

Introduction

A polyhex is a plane figure formed by joining equal regular hexagons edge to edge. A pentahex is a polyhex with 5 cells. There are 22 pentahexes, not distinguishing reflections and rotations.

A polyhex is trapezial if its cells are those whose centers lie in or on an isosceles trapezium oriented parallel to the polyhex grid. Here I study the problem of arranging copies of two given pentahexes to form a trapezial polyhex.

A triangular polyhex is an extreme form of a trapezial polyhex. Many of the solutions below are triangular. See the bottom of the page for non-triangular variants.

Nomenclature

Table of Results

This table shows the number of tiles in the smallest known trapezial polyhexes. If you find a smaller solution or solve an unsolved pair, please write.

 ACDEFHIJKLNPQRSTUVWXYZ
A•42327—9119636920——4——959
C42•542——————9—————————6—
D35•3914356333534135393212
E2423•5947956396602947179459
F7—95•—52———15—————————7—
H——149—•39———8—————————9—
I9—345239•1418347331884——4954—39
J11—57——14•20—3——18——————3—
K9—69——1820•19126————————5—
L6—35——3—19•4——12—————205—
N393615843124•3610156181212657
P6—33——7—6—3•—5—————73—
Q9—59——33———6—•———————6—
R20—36——1818—12105—•——————4—
S——460——84———15———•—————4—
T——13294——————6————•————13—
U4—57——————18—————•———7—
V——317——49———12——————•——6—
W——99——54———12———————•—7—
X9—34—————2067———————•7—
Y562579335553644137677•6
Z9—129——9———7—————————6•

Navigation

[2 Tiles] [3 Tiles] [4 Tiles] [5 Tiles] [6 Tiles] [7 Tiles] [8 Tiles] [9 Tiles] [10 Tiles] [11 Tiles] [12 Tiles] [13 Tiles] [14 Tiles] [15 Tiles] [17 Tiles] [18 Tiles] [19 Tiles] [20 Tiles] [33 Tiles] [39 Tiles] [42 Tiles] [49 Tiles] [52 Tiles] [54 Tiles] [60 Tiles] [84 Tiles] [294 Tiles] [Non-Triangular Variants]

2 Tiles

3 Tiles

4 Tiles

5 Tiles

6 Tiles

7 Tiles

8 Tiles

9 Tiles

10 Tiles

11 Tiles

12 Tiles

13 Tiles

14 Tiles

15 Tiles

17 Tiles

18 Tiles

19 Tiles

20 Tiles

33 Tiles

39 Tiles

42 Tiles

49 Tiles

52 Tiles

54 Tiles

60 Tiles

84 Tiles

294 Tiles

Non-Triangular Variants

Last revised 2025-08-21.


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Col. George Sicherman [ HOME | MAIL ]