# 12 Pentominoes

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## Theorem

There exist $12$ distinct pentominoes, up to reflection and rotation in the plane:

## Proof

Note, that all of them except one can be Definition:folded into cube without one side.

Let's name the candidates by english keys: d(b,p)&n"u)t|f,<_>+? Work to be done yet to establish method of creation...

## Sources

- 1986: David Wells:
*Curious and Interesting Numbers*... (previous) ... (next): $12$ - 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $12$