Pentiamond-Hexiamond Pair Pentagons

Introduction

A hexiamond is a plane figure formed by joining 6 equal equilateral triangles edge to edge. There are 12 hexiamonds:

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

See also

Solutions

5I:6A
D	M	P	Q
5I:6E
D	M	P	Q
5I:6F
D	M	P	Q
5I:6H
D	M	P	Q
5I:6I
D	M	P	Q
5I:6L
D	M	P	Q
5I:6O
D	M	P	Q
5I:6P
D	M	P	Q
5I:6S
D	M	P	Q
5I:6U
D	M	P	Q
5I:6V
D	M	P	Q
5I:6X
D	M	P	Q
5J:6A
D	M	P	Q
5J:6E
D	M	P	Q
5J:6F
D	M	P	Q
5J:6H
D	M	P	Q
5J:6I
D	M	P	Q
5J:6L
D	M	P	Q
5J:6O
D	M	P	Q
5J:6P
D	M	P	Q
5J:6S
D	M	P	Q
5J:6U
D	M	P	Q
5J:6V
D	M	P	Q
5J:6X
D	M	P	Q
5Q:6A
D	M	P	Q
5Q:6E
D	M	P	Q
5Q:6F
D	M	P	Q
5Q:6H
D	M	P	Q
5Q:6I
D	M	P	Q
5Q:6L
D	M	P	Q
5Q:6O
D	M	P	Q
5Q:6P
D	M	P	Q
5Q:6S
D	M	P	Q
5Q:6U
D	M	P	Q
5Q:6V
D	M	P	Q
5Q:6X
D	M	P	Q
5U:6A
D	M	P	Q
5U:6E
D	M	P	Q
5U:6F
D	M	P	Q
5U:6H
D	M	P	Q
5U:6I
D	M	P	Q
5U:6L
D	M	P	Q
5U:6O
D	M	P	Q
5U:6P
D	M	P	Q
5U:6S
D	M	P	Q
5U:6U
D	M	P	Q
5U:6V
D	M	P	Q
5U:6X
D	M	P	Q

Last revised 2026-08-11.