# Didrafter Compatibility

## Introduction

A *didrafter* is made by joining two 30°-60°-90°
triangles along equal edges, where the halves of a triangle's hypotenuse
may be used separately.
A didrafter is *proper*
if it can be placed on a polyiamond grid
so all its edges lie on the edges and medians of the grid cells.
Otherwise it is *improper*
or *extended.*
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 didrafters.

## The didrafters

These are the proper didrafters:

These are the improper didrafters:

## Compatibility figures

These figures are minimal. They are not necessarily uniquely minimal.

Last revised 2013-04-12.

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George Sicherman
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