# Pentabolo Odd Pairs

## Introduction

A *pentabolo* or *pentatan* is a plane figure formed
by joining five equal isosceles right triangles edge to equal edge.
There are 30 different pentaboloes, not counting reflections and rotations.
An *odd pair* is a figure that can be tiled by an odd number of
each of two polyforms.
Here I show minimal known pentabolo odd pairs.
If you find a smaller solution or solve an unsolved case, please write.

## 3 Tiles

## 5 Tiles

## 7 Tiles

## 9 Tiles

## 11 Tiles

## 13 Tiles

## 15 Tiles

## 17 Tiles

## 19 Tiles

## 25 Tiles

Last revised 2014-02-20.

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Col. George Sicherman
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