Tetrapent-Pentapent Compatibility

Introduction

A polypent is made by joining regular pentagons edge to edge. A tetrapent has four cells; a pentapent, five.

Two or more polyforms are said to be compatible if there exists a figure that can be tiled with any of them. Here I present some compatibility figures for tetrapent-pentapent pairs.

Here are the 7 tetrapents:

I adopt Erich Friedman's nomenclature for the 25 pentapents:

Table

The entries indicate the numbers of pentapents.

 ABCDEFGHIJKLMNPQRSTUVWXYZ
C41644820488484204884481684?48
I8168416?444844?44164484164?44
J84444844444484484444416?84
L44848488841644844844204??44
N?16?816?4?4164??48444???4?816
T162020?44???4?808??440?4???4??
Y48?8?16?48168161688?88??248?48

5 Tetrapents, 4 Pentapents

10 Tetrapents, 8 Pentapents

20 Tetrapents, 16 Pentapents

25 Tetrapents, 20 Pentapents

30 Tetrapents, 24 Pentapents

50 Tetrapents, 40 Pentapents

100 Tetrapents, 80 Pentapents

Last revised 2023-12-03.


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Col. George Sicherman [ HOME | MAIL ]