# Hexiamond Pair Pentagons

A *hexiamond* is a plane figure
formed by joining six equal equilateral triangles edge to edge.

Here I show the smallest known pentagonal (five-sided) polyiamonds
that can be formed by copies of two hexiamonds, using at least
one of each.
If you find a smaller solution, please write.

In pentagonal polyiamonds, the numbers of cells pointing up and pointing down
are never equal.
So at least one of the hexiamonds used must have unequal numbers of cells
pointing up and down.
The only such hexiamonds are **F** and **P**.

See also Heptiamond Pair Pentagons.

## 2 Tiles

## 3 Tiles

## 4 Tiles

## 5 Tiles

## 6 Tiles

## 8 Tiles

## 9 Tiles

## 11 Tiles

## 14 Tiles

## 23 Tiles

## 24 Tiles

## 38 Tiles

Last revised 2024-07-30.

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Col. George Sicherman
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