# Triangular Enneiamond Compatibility

## Introduction

The *triangular enneiamond* is a polyomino made of nine triangles
joined to form a bigger triangle.
The *compatibility problem*
is to find a figure that can be tiled with each of a set of polyforms.
Here I show minimal known compatibility figures for the triangular
enneiamond with other polyiamonds.
If you find a smaller solution or solve an unsolved case,
please let me know.

## Diamond

## Triamond

## Tetriamonds

## Pentiamonds

### Impossible

### Holeless Variant

## Hexiamonds

### Unsolved

### Impossible

## Heptiamonds

## Octiamonds

Last revised 2014-04-30.

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Polyform Compatibility
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Polyform Curiosities

Col. George Sicherman
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