# Heptiamond Pair Pentagons

A *heptiamond* is a plane figure
formed by joining 7 equal equilateral triangles edge to edge.
There are 24 heptiamonds:

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

See also Hexiamond Pair Pentagons.

## 2 Tiles

## 3 Tiles

## 4 Tiles

## 5 Tiles

## 6 Tiles

## 7 Tiles

## 8 Tiles

## 9 Tiles

## 12 Tiles

## 13 Tiles

## 16 Tiles

## 18 Tiles

## 20 Tiles

## 23 Tiles

## 25 Tiles

## 26 Tiles

## 28 Tiles

## 32 Tiles

## 33 Tiles

## 36 Tiles

## 38 Tiles

## 39 Tiles

## 41 Tiles

## 43 Tiles

## 68 Tiles

Last revised 2024-07-30.

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Col. George Sicherman
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